I reported it to Cadence and as I was reading your reply, their response came back........... Can't duplicate.
I'll send them the file I'm working on and see if that makes a difference.
I have found that if I route from one pin to the via and stop. I can then click on the rats next to the via and continue on from there, no issue. Once I tie both IC pins to the same via and stop, then try to route from the rats near the via, it jumps back to the IC pin.
We'll see what they have to say.