Z axes trouble

ok I am back with another problem. I checked the forums and saw some similar problems but not specific enough to help me. I have the xcarve up and going for a couple days now and everything was working great. went out tonight and zeroed out my work and started to carve and the machine carve about halve the work in mid air in front of the work piece. half was on the work piece the other have was in air. I tried a few other projects I had already done think I did something when I set the program up and it did the same thing. when I shut it down I goes up about 2" in front of where it was zeroed and stops. I am a little lost here. thanks in advance for any help

I will take a look at that. just can not figure it jumps forward and finishes forward. only cuts half of what it should.