Hello @dbcommunity, thank yo for contacting us. In order to further investigate this could you please answer the following questions:
What are your Shield settings set at?
What version of Brave are you using?
Can you try to go to Settings → Shields → Content Filtering and enable Fanboy Annoyances List and uBlock Annoyances List and then let us know if you still have issues?
If still have problems, try to right click on the ad and click on Inspect. It should open Elements so please provide a screenshot of that. It will be something like this: