Your rank-tracking dashboard may be hiding something: Google is serving altered search results to tools it suspects of scraping SERPs, and Ahrefs now says the problem touches 5% to 20% of results depending on the data provider.
That range lands in a blog post dated October 22, 2026, titled “An update on Google’s poisoning of search results.” Ahrefs told customers it has seen an increase in poisoning over the past few weeks, and it described its response in three parts: filters to detect abnormal pages, requests for accurate replacements, and a cleanup of stored history that may have been affected.
What Ahrefs did not say
The update carried no methodology, no sample size, no country or device split, and no affected dates. Ahrefs also did not say how far back its retroactive cleanup reaches or whether corrected data points will be flagged in the interface.
That gap is material because Ahrefs data feeds more than rank tracking. Keyword difficulty, traffic estimates, competitive analysis and AI Overview tracking all draw on SERP data. The post does not clarify which products use affected data.
Why 5–20% matters
Earlier vendor disclosures reported single rates: Nozzle saw swapped results on 8% of pages, DemandSphere on about 11% of daily checks, and AccuRanker measured rates under 1% in mid-October. Ahrefs says the error rate varies by data provider, and its 20% upper bound is the highest ongoing figure any vendor has stated. Nozzle’s 27% was a one-day peak, not a sustained range.
Your September and October reports may not hold
The risk is concentrated in a messy overlap. Google’s spam update ran from September 24 through October 8, producing genuine ranking changes in the same weeks poisoned pages entered vendor data. A drop in Ahrefs during that window could be a real demotion, a blocked collection, or a result shown only to a suspected bot.
Ahrefs’ retroactive cleanup adds another variable. A chart exported in early October may no longer match the same chart viewed today. The company has not committed to logging corrections.
Treat rank data as a signal, not a verdict
The practical framework is triangulation before action.
- Cross-check any material drop against Google Search Console for verified sites.
- Run the same keyword in a second rank tracker and compare direction.
- Date-stamp client reports so everyone knows which dataset was used.
- Watch Ahrefs dashboard notifications, then re-export corrected charts.
None of this makes rank tracking useless. It makes recent data a starting point for investigation, not the final word on a campaign. Google has not commented publicly on the vendor accounts.
Source: PPC Land
