Cup fracture, fluid simulation

Hi, my name is Hidajet and I’ve worked in this simulation that I followed from blendercookie. I have quite finished the work but I can not figure out the reason why the fluid grows up after the passage of the bullet! Can someone help me, give some advice please? Here you have my test:

My guess would be that the initial shock of the bullet hitting the cup (before the cup breaks) causes the cup to jerk and sends a wave through the liquid from the edge of the cup to the center. When the wave converges at the center, it’s got no place else to go but up. Or the simulation may be reacting to the volume of the bullet passing through the liquid. Try the same simulation but with a mug shape (flat bottom instead of rounded) or a much smaller bullet to see whether it makes a difference.