ableton 7 sync issue

Hello all, I'm slaving live to my machine drum running into the input on my presonus firebox, and while the clock is staying in sync when i trigger a loop with my mpd16 running into the input on my turbo midi. the 4 bar audio loop will play 2 bars then repeat then go into the next two bars and repeat, despite no midi notes telling it to retrigger, this is getting frustrating and i don't know what to do.

it should be mentioned that if the loop is 2 bars it doesn't jump around at all.

but i'd really like to have longer loops.

: (((((