I'm trying to bring the bass up in the mix and used a bass preset(tracking leveler) for the prochannel.
Sounds great and really works but it ducks everything else under it as if I had set up a sidechain compressor on everything to it.
Then I even gave it it's own buss and added a PC preset to that(saturated concrete)and it does the same thing?
I can duck all the others by using either or both PC presets on the bass.
It's all normal without the presets. 
Neither of them has a sidechain toggle to turn off.
None of the other ducked tracks have any FX that are set to sidechaining.

strange one that, genuinely scratching my head here, i was going to ask if you had a compressor on the master buss, but im supposing not ??

Yes there is, but switching it off does not help

routing from bass track?  sends to other buses?