How TestComplete map objects in memory and on what logical basis the objects are mapped

It's very easy to end up with duplicates or conflicts in a Name Mapping file that will end up causing it to behave badly.  

The first thing I would look for is to make sure that there aren't any duplicate branches for the area that is causing the issue.  It also helps if the branches have some unique identifier as close to the top as possible.

If you are still stuck, I suggest contacting support.  They can take a better look at your name mapping than we can from here.

https://support.smartbear.com/message/?prod=TestComplete