What gameplay feature is this bug affecting?
Breeding

What's the issue? Please include any error messages you receive and as much detail as possible.
Sent a stud request to a user the same time I managed to get out of wifi range at work; page hadn't loaded so I pressed the 'request' button again & it seemed to go through. However, this then showed that the lioness in question had already been bred but still had a pending request to the same user.

Any links relating to this bug? For example, if a particular lion is bugging, what is the link to that lion?
Lioness: #794156270375
Stud in question: #211151

Any screenshots you can provide us with?
imgur album here

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:
See above image album.