During the most recent raid, I believe I caught an uncommon Chocolate Bulbori, but he didn't appear in my stable. He was the only enemy encounter in that battle, and I used a Standard Trap. At the end of the battle, I didn't get any experience points so I assumed I caught him, only that he's nowhere to be found!

So I'm not terribly sure if it's a bug or if my trap really just didn't work and I got no points for the battle.

It's possibly the Bulbori may have fled from battle. =/
When trying to catch pets, you should pay close attention to the battle log. The notices will only be available for the specific round you just finished, so if you click to continue, you lose the information, so next time I would suggest checking the battle log to see if the pet fled or was added to your stables.

That really sucks, though. I know how you feel.

Oh, I wasn't even aware pets could flee, so I didn't even think to look. XD That would make a lot more sense! It just happened right when I would have also defeated it, so I was confused. Thanks for clearing that up.

Well next time it "disapear", just have a look at
the log first and see if it was captured, ran away
or possibly just died if you used an attack on it or
an attack that hit more than one ennemy, even
if not directly choosen the pet as the target~ ;3

Been there with a pretty bulbori... I lost him and didn't know what happened, so I checked my battle log and it said, "uncommon bulbori fled from battle"