Yes the problem went away when I copied from within the nest, pasted over the main sequence and then made a new nest out of it.
I don’t think it is a off sync due to a slip edit function as there are no off sync indicator on both the audio and video tracks where there will be a number indicating the number of frames that is offset. I have a screenshot of this audio indicator which I will post it for you to see.
Also, I noticed a quirky behaviour with nested tracks and audio and I will start a new thread on this.
-chrispy