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.
When I reverse bred with another player, I used an IBF and yet the cubs showed in neither of our prides. However, when I clicked the lioness’s cubs bred, they showed up there with pride being unknown.

The person who did the reverse breeding with me is able to rename the cubs but not able to anything else with them.

Also, if I clicked the “unsorted” button that the cub supposedly belonged to it would say invalid user ID.

Any links relating to this bug? For example, if a particular lion is bugging, what is the link to that lion?
The Reverse Bred Lioness: https://www.lioden.com/lion.php?id=794186122217

Cub 1: https://www.lioden.com/lion.php?id=794197194431

Cub 2: https://www.lioden.com/lion.php?id=794197194432

Any screenshots you can provide us with?
No, sorry. The only screenshots I could provide you with is of the mother and her cubs and not the process in which I gave the item.

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:
1. Me and the person I reverse bred with worked out how we were going to split the heat and deal with items as we were using a lion scrote on a dwarf to get dwarf cubs. (Which both of the cubs ended up being)
2. The request came through with the scrote and I accepted. The lioness was bred and I refunded spent SB.
3. We compiled some of our GB and purchase an IBF.
4. I used the IBF on the lioness.
5. The cubs belong to no pride and can only be accessed through the mother and have not shown up anywhere else.

Edit: We used aging stones on the cubs and everything worked out but I am going to keep this up here in case it is needed as help with a glitch!