Off the top of my head I want to ask, does anyone see a correlation with the grouping of shows and the Fox/Whedon material that is leaving April 1? Maybe they are trying something in preparation with all the CBS shows that are forthcoming?
I don't believe it has anything to do with any new content incoming. More likely that the Whedon shows are on the same contract as 24, X-Files and other Fox related shows that also expire on April 1st. I'm not 100% sure, but I think most of them came on at about this time last year, so it probably was a one year agreement.
As for the original problem of the OP, sounds to me like the content may have been offline, so it would have removed from all queues, then became available again, so it came back onto the queue, just out of order. Probably all went to the saved streaming area, then came back.