What gameplay feature is this bug affecting?
Reverse Breeding

What's the issue? Please include any error messages you receive and as much detail as possible.
I have breed my gal to someone and she gave birth today, i noticed when i clicked on the cub(s) i could not take them to wardrobe from the profile and had to copy the ID and physically take it to wardrobe, i could not click on its name to jump to another because it did not have one, normally it would say "cub" instead it was empty and the arrows will not take you anywhere.
you would have to click on the den and the mom to see these cubs. now the message that pops up is
"ERROR 50.7: Invalid user ID"
the cubs also do not appear in the den with her as they usually would. they also are not in the other pride it says they belong to, nor in the den labeled "unsorted".

Any links relating to this bug? For example, if a particular lion is bugging, what is the link to that lion?
1. the female cub
https://www.lioden.com/lion.php?id=794179986975

2. the male cub
https://www.lioden.com/lion.php?id=794179986976

Any screenshots you can provide us with?
i cant post them.

Please provide us with step by step explanation how this bug happened so we can attempt to replicate it. If it's complex, please include screenshots where possible:
i do not know how this bug happened, i only just noticed it when i checked in on her pregnancy just today, if there was something to effect it, it may have been RO.