Comment by yourduskquibble

Are you using chrome and also have either uBO-Extra or Nano Defender installed? If not it's most likely the ads are being served by Instart Logic. [1] [2]

[1] https://github.com/gorhill/uBO-Extra/wiki/Sites-on-which-uBO...

[2] https://github.com/uBlockOrigin/uAssets/issues/227