Event Viewer Malfunction

O.K. I got something wierd this morning that I wanted to know if anyone has seen before. I was reading some stuff on Computer Manager and brought up my event viewer. To my shock the files were all jumbled up like they were broken up and then dovetailed back into the lists out of order(4/17 listed in the middle of 3/13 etc.).

I immediately thought of a virus, and updated AVG and ran it. It found nothing, so I went back to the event Viewer and it was all streightened out. I can't figure out what happened. Anybody seen anything like this before??