Hi, this is my first post here. Just over a month ago me and the missus went to a rescue centre and re homed two kittens about 6 months old. They can use the litter tray fine, but they had a few bad habits when they arrived such as climbing on the kitchen sides when preparing food. They don't do any of that now. However one of them has started scratching the carpet at the bathroom door, but only when someone goes in there. He won't go to it any other time and even if someone is downstairs playing with him and someone else uses the bathroom he will be straight up there scratching, he doesn't do this in front of any other room either. They both have toys to play with, two scratching posts, a massive cat tower and we playing with them once a day hunting the laser pen. They both love playing with toys on an elastic chord, however, one of them will catch it and bite the elastic off and walk away, ruining it for the other cat. Both are chipped, vaccined and done. Any help would be appreciated here, thanks.