List of Common Amazon Seller Mistakes

Updated: March 2026

With over 9.7 million active sellers on Amazon worldwide (Oberlo, 2025), the competition for visibility is fierce. In that environment, even small mistakes can cost you sales, rankings, and ad budget. At Kangaroo UK, we audit Amazon seller accounts every day, and we see the same mistakes repeatedly, from new sellers making their first listing to established brands managing hundreds of products. Here are the most common ones and how to fix them.

Are You Running Ads Before Your Listings Are Ready?

This is the most expensive mistake we see. Sellers launch Amazon PPC campaigns before their listings are optimised. The traffic arrives, the listing doesn’t convert, and the ad budget disappears with little to show for it.

The fix: Make sure every listing is retail-ready before you increase ad spend. That means an optimised title, high-quality images, keyword-rich bullet points, A+ Content, sufficient reviews, and competitive pricing. If the listing doesn’t convert organic traffic, it won’t convert paid traffic either.

Are You Ignoring Negative Keywords in PPC?

In the accounts we audit, the single biggest waste of Amazon ad spend is a lack of negative keywords. Without them, your ads show for irrelevant searches and you pay for clicks that will never convert. We regularly find accounts where 20–30% of ad spend is going to search terms that have nothing to do with the product.

The fix: Review your search term reports weekly. Any term that’s costing you clicks but not generating sales should be added as a negative keyword immediately. This is basic PPC hygiene, but it’s the most commonly neglected task we see.

Are Your Product Images Costing You Sales?

Poor product images are a silent conversion killer. Blurry photos, cluttered backgrounds, missing lifestyle shots, or using only one or two images when Amazon allows nine — all of these reduce the shopper’s confidence in your product and send them to a competitor with better visuals.

The fix: Use at least 6 images per listing. Your main image must be on a white background (Amazon’s requirement). Include lifestyle shots showing the product in use, infographics highlighting key features and dimensions, and a scale reference image. If you’re Brand Registry enrolled, add video too - it consistently outperforms static images for engagement.

Are You Targeting the Wrong Keywords?

Many sellers either target keywords that are too broad and competitive, or they optimise their listing once and never update it. Amazon’s search landscape changes constantly — new competitors enter, shopper language evolves, and seasonal trends shift what people are searching for.

The fix: Treat keyword research as an ongoing process, not a one-off task. Review your search term reports from PPC monthly, use tools like Helium 10 or Amazon Brand Analytics to identify new opportunities, and update your listings and backend search terms at least quarterly.

Are You Letting Stock Run Out?

Running out of stock is one of the most damaging things that can happen to an Amazon listing. When stock hits zero, your ads stop running, your organic ranking drops immediately, and the sales velocity you’ve built up vanishes. Recovering from an out-of-stock event can take weeks, sometimes longer if a competitor fills the gap.

The fix: Monitor your FBA inventory levels weekly and set reorder points based on your average daily sales rate plus a buffer. For deal events like Prime Day, have at least 4–6 weeks of stock in FBA warehouses with replenishment already in transit. Use Amazon’s inventory planning tools in Seller Central to forecast demand.

Are You Ignoring Customer Reviews?

Reviews are one of the strongest trust signals on Amazon, and ignoring them, positive or negative, is a costly mistake. According to eDesk, ignoring negative reviews can reduce conversion rates by up to 70%. Shoppers read reviews carefully, and how you handle feedback often matters as much as the feedback itself.

The fix: Monitor reviews daily. Use Amazon’s Request a Review button to encourage more reviews from satisfied customers. For negative reviews, read them carefully; they often contain genuine product feedback you can act on. If a review violates Amazon’s guidelines (profanity, personal information, or not about the product), you can request removal through Seller Central.

Are You Setting and Forgetting Your Campaigns?

Amazon PPC is not a set-it-and-forget-it channel. Bids, budgets, keywords, and targeting all need regular attention. We frequently audit accounts where campaigns haven’t been touched in months, budgets running out by midday, underperforming keywords still active, and profitable terms not being scaled.

The fix: Review campaign performance at least weekly. Adjust bids based on ACOS targets, pause underperforming keywords, add new converting terms from your search term reports, and reallocate budget from weak campaigns to strong ones. Daily monitoring is ideal during deal events and peak seasons.

Are You Overlooking Backend Search Terms?

Amazon gives you 250 characters of backend search terms, keywords that are invisible to shoppers but indexed by Amazon’s algorithm. Many sellers either leave this field blank, fill it with duplicates of their title keywords, or stuff it with irrelevant terms.

The fix: Use all 250 characters for terms that don’t fit naturally in your visible listing. Include common misspellings, alternative product names, related use cases, and any relevant terms you couldn’t work into your title or bullets. Don’t repeat keywords already in your listing, Amazon only needs to see a keyword once to index it.

How Do You Know If You’re Making These Mistakes?

The honest answer is that most sellers don’t know until someone else looks at their account with fresh eyes. It’s the same as proofreading your own writing; you’re too close to spot the errors.

That’s exactly what our free Amazon account review does. Our team will look at your listings, your PPC campaigns, your keyword strategy, and your account health, then tell you exactly what’s costing you money and how to fix it. There’s no obligation and no sales pitch — just a clear, honest assessment of where you stand.

If you want ongoing support, our Amazon account management service covers all of this as standard. We monitor, optimise, and manage your account daily so these mistakes don’t happen in the first place.

Think your Amazon account might have some of these issues?

Our Amazon team will audit your account and tell you what’s costing you money.

Book a free Amazon account review or call us on 01530 560177.

Author

Abhilav Vishwakarma, Amazon Marketplace Leader - Abhilav leads the Amazon team at Kangaroo UK, managing Seller and Vendor Central accounts for brands across the UK. He conducts account audits daily, identifying and fixing the issues that hold sellers back from reaching their potential on Amazon.