28 day rule broken?

I have a TiVo HD with the 9.1 update.

I have a keyword wishlist for Titanic. This Sunday on the History Channel there is a documentary "Titanic's Tragic Sister" at 9:00 p.m. and is repeated at 2:00 a.m. My TiVo shows both showings are to be recorded in the To Do List. I thought the TiVo isn't supposed to record the same episode of anything within 28 days. Is this a 9.1 bug?