In my experience mosfet divers are very sensitive to supply variations, you have to make sure the ground is good hefty connection, as well as the power, and you need to have the driver well decoupled, a large electro and a couple of ceramics.
Did you build a pcb to the original designers spec, or did you build it on a breadboard or veroboard, if the latter 2 then thats gonna be your problem, last time I tried using a mosfet driver on a breadboard it went kapow along with the fet.