Multisim and Ultiboard

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Help can't figure out why the mosfet driver refuses to work

I originally built this circuit with a timing signal into a continuous toggle jk flip flop then into mosfet driver and mosfets and the circuit worked as expected no issues. But when I remove the timing pulse and jk flip flop and replace with lm311 and voltage translator ltp the fet driver stops working. I can put a scope on the driver inputs coming from the translator and it is getting pulses referenced to com but it's as if the fet driver doesn't see them or is at a different level. I'd start pulling my hair if I had some, any help much appreciated. 

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