When I train, this -> [you must login to view links] pops up, showing 2 of the same images, the duplicate being where the ads should be. Whenever I click, it keeps telling me to slow down (and I only click once every 1-2 second, and it tells me I clicked less of a second ago). Can anyone tell me how to get rid of this?

I tried snowclaus's idea, didn't work this time.

[you must login to view links] <- heres another one. it seems to replace only the ads.

Bump it up :/

i get that sometimes just try to refresh your page and youll be fine. happens all th eim

[you must login to view links]
Even almost a year later, it comes back to haunt me. This reduces my training time by a pretty good amount, so I'd say it is a problem.

yeah rich it appears to me aswell and it slows up my training i hope it gets fixed.

it's been effecting me for the last two days, so i'd say it's been caused by an update or the like

Well it has happened with me as well but i just refresh the page and its fine then.

It comes for me too, but I don't see it slowing down training.
But, still it needs to get fixed.
From what I think, it comes because of slow internet. Your internet can't load the advertisements, so the space of advertisement gets filled with the Pokemon boxes above.
Try updating Firefox or whatever browser you are using, or try using a different one.
I can't say I am correct, I just think that may be the case.
Because, whenever a page loads, it creates things, so maybe the advertisement wasn't completely created, and the window was scrolled, so the Pokemon boxes' impression was left there.