i had problem before with Allowed Sites in adsense and i know it still has problems but im confused now look at this pic and u'll know what i mean
this top five ip addresses belong to Google, it is probably because somebody was looking at cache of your page on google I have no idea why would you get that last one, I would contact Google if I were you, looks like bug
yes its bug that not the first time i noticed this ,many people said that allowed sites isn't completed yet and it has few bugs i wonder when google gonna fix it
This Allowed Sites feature always brings such a results. I'm not sure why but it seems there are some small glitches. Nothing to worry about though.