It happened again. Although my Season Pass to SyFy's "Face Off" is set to record only the first-run (9pm) episode each Tuesday, my To Do list said the 11pm repeat was also going to be recorded, so I canceled the 11pm repeat, making sure the 9pm first-run airing was still checkmarked.
When I woke up this morning, the first-run 9pm episode "was not recorded because the same episode appeared in the My Shows list within 28 days of this broadcast".
For some reason, TiVo is not recording the first-run episode after I manually cancel the repeats that should have never been scheduled in the first place.
Although I am infuriated the TiVo software and/or guide data is causing this problem, as a workaround for next time I'm going to manually select the first-run episode to record after canceling the repeats so it "locks in" the time slot.