Imp-Throwing Gargantuar Doesn't Trigger

In PvZ Heroes, I tried today's Puzzle Party with Unlife of the Party and the two Imp-Throwing Gargantuars, and I did it the only two ways that I figured it could have been possible. The triggers on the Gargantuars is all out of whack; I tried the challenge 8 times and it did not work any of them. Every time I tried it, I placed Unlife of the Party in the 4th lane and an Imp-Throwing Gargantuar in the 1st lane. I switched between putting the second Gargantuar in the 2nd and 3rd lanes, but got the same bug with both.

There is a significant issue with the imp throwing triggering. Half the time, the two pear pals both damage the Gargantuar and he triggers correctly; that is, he throws two imps into the two unoccupied lanes. Half the time, the game screws up and he only throws a single imp, and I lose. That is the first problem -- half the time he only triggers once. I repeated the level a couple more times, and found that the only problem is with his whacky triggering. Sometimes, I can see him throwing an imp before combat resolves, which he is not supposed to do and most of the time he doesn't do. The most recent time I played, he did something in between the two and threw an imp that apparently had Team Up.

It's annoying that I cannot complete this challenge because the game is messed up, and I'm kind of disappointed that you guys would put this challenge out there with its problems. Please fix.

Also, I can post pictures if you want/need them.