Please take a look at the following for possible explanation and then we can discuss the matter further.
Thanks for the feedback. It looks like a bug in PE11. I tried re-laying the
audio but nothing worked. Finally I deleted a whole bunch of edits and
closed up the gaps. Finished the project yesterday.
The problem was almost like you're allowed so many Delete and Close Gaps
and once you reach the maximum that's it!
Appreciate your reply.
Thanks for the follow up. Glad that you completed your project successfully.
The Delete and Close Gap issue relates to what is above or below the place where you want to delete and
close gap. And, also as presented in the blog that I cited previously.
When you are forced to do the manual delete and close gap, the dangers reside in disturbing the existing
Timeline in doing so. For that we need to discuss the use of what are called keyboard modifiers as part of the move.
The following link may help in that regard. I present it for informational and not promotional purposes
Best wishes as you move forward with your Premiere Elements projects.