I think in the first instance the map was Vielsalm- there's a small slope at the top left of the bottom base area. The pak gun just walked into some kind of snag & just stopped. The infantry just froze too & didn't look like they were pulling the Pak. It was just stupid that after getting mortared half to death no damage & stuck in a crater.
I think with the tank the volks were actively trying to use the tank as cover as they kept running back & forth whilst getting squashed.
There's your problem. You played on Vielsalm
I always veto that map no matter which side I'm playing.
Serious response: there is some weird pathing bugs from time to time but they will hopefully be mostly gone after the December patch