What gameplay feature is this bug affecting?
Lion fertility

What's the issue? Please include any error messages you receive and as much detail as possible.
So, I used my tackweed as usual on my lioness, Apollo, when I used it she was perfectly set at (-1%). But a few days later, her fertility dropped even more down to (-4%) she is now infertile. I couldn't use any boosters because I already used tackweed.

I used Tackweed on her 2 times already and the other first try, her fertility never dropped so low!

Any links relating to this bug? For example, if a particular lion is bugging, what is the link to that lion?
None.

Any screenshots you can provide us with?
None, I didn't expect this to happen, so I don't have a screen shot of the before and after, etc.

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. I used tackweed.
2. Few days later, her fertility dropped more than it was supposed to.