Fields don’t follow the conditional rules after a while / after changes

I use the pro version and see some peculiar behaviors that prevent me from going live now.

The main problem is that the showing/hiding of ?elds don’t follow the boolean settings at all times. When I configure a new field group, things work fine. But after some changes, it starts to show unexpected behavior.
This seems to happen after you change something in a previously con?gured ?eld. Either a ?eld doesnt react anymore on an option change of a ?eld it depends on, or it works completely opposite (show when should be hidden and hidden when should be shown.

Another problem is that, whenever I choose to set a default option (I check the ‘selected’ checkbox behind an option), the ?eld indeed shows the correct default value, but when the user changes that value, the rules are not followed. The ‘selected’ option kills conditional rules. Removing the check on ‘selected’ makes it work again. This makes the ‘selected’ function useless.

After trying other boolean configurations (instead of ‘value is equal to’ option X, I use ‘value is not equal to’ all the other options…kind of tedious worksaround), the ?eld group ends with no response at all. It feels as though some database ?eld is not updated of cleared. I can’t repair it by changing values and updating, and then changing values back. At some point, the whole group doesn’t work anymore, despite correct configuration.

By the way…at the same time, another field group with the same configuration works fine. I don’t know for how long, however.

Any clues? Reinstalling the plugin doesnt help.