so I woke up this morning to grunting or some sort or weird sugar glider noise and I see one sugar glider chasing the other in the cage. When it finally catches the other it bites the others tail then the sugar glider that has gotten bit puts its tail in its mouth. I've separated them for now but i'm sure this happens when i'm not around. Has this happened to anyone else?

I do not know, I've never had that issue before. Hopefully someone with experience in that behavior will offer some explanation, gliders have so many behaviors, I don't think anyone understands them all.