Lately a stray I took in KEEPS GOING UP THERE even if i put boxes or stuff in the way he'll jump up and push them away to go on top. For his safety I have a box on one side but he KEEPS GOing back. For reference I have 2 ikea detolfs i got from fb marketplace and offerup a while back. Not sure if ifs the newer or older model but I know too much moving weight isnt good at rhe top. I don't want to put heavy boxes up there but what would you do? This stray I've had a few months is seperate from my other cats so I can't really take him out. Nor move my detolfs because my living room has 5 others out there????????Any advice or funny comments are appreciated.