Same issue over here. I use both a MacBook laptop and an iPad. Doesn't happen on my laptop, just on the iPad. I emailed the webmaster for the board, and she said it's an iPad issue. (IMO, probably iOS issue in general) She suggested I download an ad blocking app, but, since she told me she "only uses real computers", couldn't tell me where to find one.
In my view, if you are a webmaster and care about your user's interface experience, you will be on top of how your site appears on ALL devices your users are likely to be on.