I just noticed it as well. Wife was watching some other show and when it went over I noticed that there was no recording in progress. Missed the first hour! If you go into the "To Do" list it is scheduled for tomorrow night at 5:00PM. Strange.
It is scheduled tomorrow also in the guide. As a guess something prevented the recording to take place and the receiver went to the next airing to record.
Looks like they did reair RAW after all although it was not the full Monday night show. Maybe this is going to be a new WWE programming block on Tuesdays now.
Raw Experiences DVR Issues- Many people who set their DVRs to record Raw (myself included) experienced issues, as DirecTV instead recorded the two hour version the next night. This won't be a problem going forward, as PWInsider reports the two-hour Raw isn't scheduled for next week. http://wrestlinginc.com/wi/news/2015/0701/597851/heat-on-wwe-diva/