Sadly, that did not solve the Problem.
But here is what I've found out:
1. Remove the rule from the Attachments Control
2. Right click on Attachments Control -> Appearance
3. Visible -> Expression -> fn-Not(Is New Mode)
4. Apply the rule to all other fields, until you get the some behaviour like for the Attachments Control. In that Case, repeat the Visible Expression from above.
Its my experience that the Expand-Collaps function can be a bit buggy. What is very important is that the controls are correctly alligned. A way to ensure this is to simply release the 'Snap to grid' and re-enable it.
You will find it under Settings --> Snap to grid.
It is Yes per default, but choose no, and the then yes again. It will give you a warning as it will re-align all controls in your form. Click ok and publish your form. You can now see if this is the issue...
I hope this will help you!