This is not really a bug or a glitch, but it is almost definitely an error.
Fat Princess’s Pattycake (forward+Triangle) doesn’t always combo with its follow-up. It isn’t an issue with spacing. The only time it works 100% is when the opponent is against the wall.
The first part of the move has two hits, and the follow-up does two more. If the second hit of the first part connects, then it will combo into the follow-up. Problem is, the second hit, of the first part, misses often. This makes the move almost completely useless. It’s like a 50/50 chance that your attack will actually work, which is not what you want in a fighting game.
My suggestion is to extend the hit-box of the second hit, so that the move actually works.