Level Shifting a MOSFET
What might be happening is that, during turn-off, voltage drop across 2n7000 might be bigger due to 3.3V dc source being near to 2n7000 threshold voltage(check in datasheet) when it is applied across VGS.
Edit:
Explanantion: During turn-off, the charged Q1 gate capacitor has to be discharged and the path following is through the Q2 and logic controller ground. Looking at Q2 datasheet, at VGS = 3.3V, you can get Id = 0.04A(approx, from the ID vs VDS curve). Since Q1 gate current would be discharged at 0.04A causing the turn-off process to be slow. Also the VDS Q2 would increase for cap to discharge slowly since the IdQ2 current cannot increase beyond 0.04A.
Kindly check the signal on oscilloscope at Q1 drain when applying signal. If it follows the same thing, then, we can extend the discussion.