AdChoices in front of the website

Use a addblocker ---> problem solved ;o)

Unfortunately, that ad issue- among others- is a long standing one, and the basis for why many of us who don't mind supporting the site have enabled adblock on it. cg hasn't replied to our previous concerns on the matter, so adblocking or reloading the page until you get a new ad seem to be our only options. [If it's persisting through refreshes, you can try a cache clear refresh or restarting the browser.]

Also, do note that AdChoices isn't an ad provider, but a privacy-protecting opt-in program for advertising companies; Google actually operates under the AdChoices program itself.

https://en.wikipedia.org/wiki/AdChoices

Same issue started for me today

Tried reloading and it went away

Perhaps this could be fixed by adding some responsive css in the ads that are in the way.
https://support.google.com/adsense/answer/9183363?hl=en
by adding a style with max height for mobile and other screen sizes.
Although that does not always work, sometimes google ads ignore them :).

this happened to me too

Thanks for the notice. The sidebar advertising is setup with our ad partner to specifically display 300x250 advertisements. I'm assuming they made an error and accidentally ran a campaign with the wrong ad sizes in that space. I pulled the ad network for now to resolve the issue and I'll send them a message to see what happened.