I have a bunny problem! any help? :/ please

My gorgeous bunny archie came home from his holiday home ( a couple who looked after rabbits) for two weeks while I was away, and he doesn't remember how to use his litter tray anymore, whilst before he used it perfectly, now he poo's everywhere and anywhere!
Is this just because of the change, will he return to his tidy self?
xxx laura

He might take a couple of weeks to settle - He may be making the place his again.

Is he neutered? If he's hormonal, that can make them untidy

yep, perfectly normal - especially if they had much less space at their bunny-hotel.

With mine their loo habits are normally disrupted for about a week before going back to normal.