What gameplay feature is this bug affecting?
Lioness Breeding/other

What's the issue? Please include any error messages you receive and as much detail as possible.
The mentioned lioness’ page says she was “bred 22 days ago”, and she’ll be in heat in one day. She’s an ncl, says she was brought into my pride on May 25th, but I’ve never seen her until today. I usually breed and then kill ncls within a short time span, so she would’ve been bred or still in heat. The time span between when she “joined my pride” and how long ago she was bred don’t match up. Not sure where or when I got her, but she doesn’t have any former prides, either.

Any links relating to this bug? For example, if a particular lion is bugging, what is the link to that lion?
https://www.lioden.com/lion.php?id=794151508962
Mentioned lioness ^

Any screenshots you can provide us with?
Not sure how to add screenshots.

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:
Logged on, checked my “Unsorted” cave, and there was a lioness that was there, that I had never seen before nor recall claiming. Not much else I can provide.