Settings & keep-time · Rules and safety floors
What does the "Raise … to … floor" button in Settings → Rules do?
Short answer: It raises every rule whose age is below the hard floor to match it. Those rules already run at the floor; the button makes the stored ages match what actually happens.
It updates every rule whose own age is below your current hard floor so the stored age matches the floor. Those rules already run at the floor anyway; the button just makes what's written match what happens, so the list is easier to read.
If you'd rather keep the lower ages, the alternative is to lower the floor itself under Global overrides — which asks you to confirm.