Why Amazon Ad Reports Stopped Matching Real Sales

If you run paid campaigns on Amazon, you have probably noticed something strange this year. The ad dashboard says one thing. Seller Central says another. The gap has been widening for months, and no amount of creative testing or bid tweaking closes it.

You are not imagining it. You are not alone, either.

The Pattern Most Teams Miss

The conversation usually goes the same way. Marketing blames creative fatigue. Creative blames the algorithm. The algorithm gets blamed for everything. Meanwhile, the actual leak is sitting inside a tool nobody on the team really owns — the cookie consent banner on your website.

What Quietly Changed in 2026

Amazon now only fully trusts user consent when it arrives through its official path, called the Amazon Consent Signal (ACS). Cookie tools that were not certified by Amazon often send hardcoded or incomplete signals. Amazon then defaults to restricted tracking, and large pieces of your campaign data quietly fall away. The sales still happen. The dashboard simply stops showing them.

That single shift explains most of the reporting gap brands have been chasing all year.

Three Signs The CMP Is The Real Culprit

• Reported conversions slipping below real Seller Central revenue every week
• DSP and Marketing Cloud audiences shrinking with stable site traffic
• Restricted features quietly appearing inside the ad account

This overview of the new Amazon advertiser standard explains exactly how the damage forms behind the scenes. For brands looking at certified options, Seers AI is one path that was built around ACS from day one rather than retrofitted later.

The gap is fixable. Most teams just need to know where to look first.