Menagerie Deleted my Craicic Chimeral Ref # 2,668,910,685

The game deleted my only Craicic Chimeral which I just captured in the map.  I did not have a frog before this map.  Right after I captured it, I checked the beast tab while in the map and that was the only frog that I have.   I wanted to finish the map, then itemize the frog.  

After I finish the map, was about to itemize it, and the frog was deleted from menagerie b/c it  was full when I was in the map. 

I did an F8 screenshot but don't know how to  attach it.

I have been deleting my beasts continually everytime it is full.

The Craicic was not an older beast because  I Just Captured It.

Ref # 2,668,910,685