Do you use the helper script to add these buttons to HITs?Pandacrazy.. I turned off my TM
Every time you add a HIT by pressing that Search button PandaCrazy will start a search for HITs from that requester. That's what would be resetting your search filter I think because it will only search for stuff that you're qualified for (stuff that it can actually grab).
You can look in the list of pandas that you have running and anything that's performing a search like that will have a darker color than the others, like the one on the right here:
Disable any of those and your filters should stop resetting.