Steps to reproduce:
1 - Change a sheet to "Card view"
2 - Open one of the cards to view the details
3 - Scroll down to a field and click inside the cell
4 - Does the details window anchor back to the top thus not allowing you to click in the details field?
If so, I logged a request for this just now: 03425917
I had an alert that there had been updates applied, and I wonder if this is a result of those updates.