im going to repeat this. have u ran swtor repair on the launcher, this seems like your problem. for the thing from the stars is the only glitch that i know of and seen the problem. Operator IX has not had any glitch of being untargetable for raid group i have seen and seems like a corrupted file. the vortexes i have seen a lag in for damaging but they have a spawn timer not a spawn on damage like the adds, this is for the first phase of the fight so they won't spawn at the same times.
I ran the repair so we'll see if anything has changed.