Do you have "Select Entire Contents on Entry" specified in the Behavior section of the Inspector's Data tab?
I think that's the cause here and clearing this check box should eliminate that behavior.
I tried it with it checked an not checked and it opens the record window both ways.
Must be something else. I don't get that with or without that setting...
Any script trigger set on this field such as an OnObjectEnter trigger?
There are no script triggers set on these fields. It does it on every container field I have. I have about 15 of them.