they are settling in to their new home, probably "marking" it in some weird way. do you make sure to feed them in the same place all the time and ensure you dont move their litter around.
when you move a cat to a new home one every few hours for a few days you should take them to the clean litter and put them in the tray. grab their paws and make them "scratch" around a bit so they get the feel for it and get comfy with it.
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