Plz help me out

[Gyrosphinx]

I am working on my spacemarines, I was about to finish my Tankhunter when several errors occured: The feets suddenly begun shifting out of exsistense when it attacked and disappeared when it did anything else, the attack particle from the marine shows up with every animation (want it to dissapear) and the gun have something wrong with the attached rockets and the barrel. Could someone please help me out?

 

[Guessed]

What modifications have you done so far to get to where you are?

 

[Gyrosphinx]

Mostly Geomerging, a little unsuccsesful particle add... yeh that was all.