For the auction it's most likely because the bidder had no den spaces available when the auction finished.
For the pop up that could be multiple reasons, but it's got nothing to do with WolfPlay.
Sometimes it's something to do with your internet browser, other times clearing your cache helps stop the pop up.
It's also possible that an app you downloaded is causing the popup(I've experienced the app side of this several times, as well as the internet browser and having to clear my cache, I'm unsure what app(s) was the cause but each time when clearing my cache and using another internet browser failed I deleted a few of the most recently downloaded apps, it solved the problem)
Sometimes it's something else entirely, but if it's none of the above possibilities, it's unfortunately very possible it's something much more serious: like a virus you got from an app or by accidentally clicking something, or something wrong with the phone itself.
I'd recommend clearing your cache first. If that does nothing, try using another internet browser and see if that solves the problem; if neither of these fix it then try deleting some of your most recently downloaded apps
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