Litter issues

I have two pairs of rabbits (they never meet up) they both used to be litter trained and very good but recently both couples seem to have gone completely backwards with their litter training and im clearing lots of poop from the floor!! Any ideas????

Could it have been the arrival of the other rabbit you mentioned on the other thread? It could be down to territorial marking. Hopefully if you clear up poops regularly they will improve :thumb: