It’s really kind of an annoying bug, I like to maintain a visual aesthetic to my profile including my UGC items I publish which I like to change once in a while, but I’ve been getting the same error ALSO for a while, only I don’t get a “remove from profile”, it just says “add to profile” and I know I manually selected and chose these specific items prior to the bug.
I hope it gets resolved soon. It also works as a bit of an advertisement in the sense that putting my latest items in my Collections tab helps bring more potential buyers for my items.