Whenever object itself is empty then you will find every widget in read-only mode.
Please check while creating object you are also creating associated object that you want to modify.
This happens when the opportunity object comes empty. Do recheck whether the object is not empty.
Replace association with microflow, set breakpoint and check whether it is coming empty or not.
Hope this helps!
Seems the OpportunityCardDetails_Deal_Version association is empty, you need to set the right object to make it work.