New Edgun Leshiy and hand pump questions...

I just got the Leshiy 2. My scuba tank is down to 200 bar, so I used a Hand Pump (FX 4-stage) and pumped it up right to 280. After using it with the pressure down to 150 bar, I tried to pump it up again but this time it just won't do it- the probe seems to be really really loose and will not engage the gun with pressure. Anybody know what might be going on ?