I've seen it many times in 7.6.1.x too. The column expanding issue doesn't cause a problem, you can continue to edit and save the change. But for the element jumping issue, I had to reset the change, otherwise, it will break the layout.
I also saw another new issue with MAS 8.11, when creating a new single app, when adding a new column to the table header, everything disappeared. I had to edit the app in XML.
------------------------------
Viet Tran
Relia App Development & Consulting
https://relia.app------------------------------