How to disable Anchor ads in AdSense?
1. In your AdSense account click Ads > Overview > By site.
2. In the table of sites, click Edit next to the site you are interested in.
3. Under Ad settings > Ad formats turn off Anchor ads (for both mobile and desktop) or Anchor ads > Wide screen (for desktop only).
4. Click Apply to site.
Disable Anchor ads on all devices
Disable Anchor ads on desktop only