The firmware does NOT log the reason why a program was skipped. It only logs actions that have happened, not those that did not happen.
If your program was set to ‘Use Weather Adjustment’ and the watering percentage happens to be 0, then the program won’t run. It sounds like your program initially was set to Use Weather Adjustment, and you subsequently removed that options. So perhaps it didn’t run because the watering percentage was 0 that day.