No, don't be worried.

This can happen sometimes when the hotel "takes control" of the reservation. It's usually just a way for the hotel to put you ina "special case" category on their end.

If you have the Triprewards' confirmation email (from the claims department) you are set. If you call the hotel itself, they'll be able to confirm your stay for you. If you want another email confirmation (or if you need to cancel for whatever reason) call Days Inn Customer Service (not Triprewards) and they will be able to provide you that.

This has happened to me at least 10 times, and I've checked in/out successfully in all cases. So worry not!