Usually it's a player teaming up with Jason to screw over counselors, people running over counselors with the car, or players glitching the map so Jason cant get them.
You also have people that rage quit so Jason doesnt get the kill added to his total and mess up the kill animation. Then of course you get players who just want to beat up on Jason and tea bag him instead of actually being productive.
It's not ideal but it doesnt get in the way enough to be a big issue really.
Was grinding Ratchet and Clank yesterday for weapon experience for about 40 minutes, I was up high and not collecting the dropped bolts, and the frame rate got down to like 10fps, went to go collect them all, and my console locked up. Had to unplug it.