Hey guys I figured this is a bug.
After hitting an opponent with a leap cross up Grodd can't continue his combos like he normally does. In the video I first do a regular combo. You can notice that after the 10 Grodd is unable to continue the combo. This is normal behavior and is done to prevent Grodd from having an infinite combo. On the second combo I try to do the same combo but after a cross up leap hit. In the second combo you can notice that the hits no longer connect after the 6 hit which is not normal behavior.
I believe the condition to prevents infinites is triggering before than intended when you land a cross up leap hit. A regular cross up jump works normally this issue only happens with a cross up after his leap move.