Yes, this is also happening to me, and mine are also lvled on Alt 3 it's horrible. I have been trying all kinds of things but can not get them to come over with their lvls at all.
it's some kind of rollback or more like desync between ALTs and MAIN pertaining to pets.
A few days ago I lost some horses in MAIN and got them back in the stable when relogged to some ALT
I am having the same issue. on Main I have a brown bear, and on all other alts he doesnt exist. Yet I have a black bear on main that is level 50 and on alt 4 he is level 28.