I was wanting to change a setting on a Room Lighting app. I went into the rule and notices when I selected the option Set up Lighting Periods or Re-Capture Devices where I have Vary Lighting Settings Per Mode, I noticed that the Hub Modes are missing from the screen. Changing one of the lights from 75% to 100% trashed the entire rule. I looked at another similar Room Lighting rule and the exact same thing occurs.
Notice in this screenshot that you have no modes selected. That's probably what the problem is. How you got into this state is a mystery. You might want to restore from a backup.
I went back a couple of backups, same problem. The first time I go in, the Modes section looks OK. If I then hit Done with Periods, then go back into Modes, the drop down is blank. If I select the Modes there, they all populate with the current mode, and I have to go in and adjust all the other modes. It was a hassle, but easier than recreating them from scratch.