vaccum chamber

This is a distillate in a vac chamber at -22 hg mercury. Please tell me whats happening. Its bubbleing more then useal turning very light almost white color. Then it darkens heavily with a few seconds??

Im pretty new to this site but still i need help. Ive been making bho for a few years now and have always had pretty good success. This morning i came downstairs to check my vac chamber everything was fine come back not evem 30 minutes later to find my slab covered in oil from my pump and my...