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I don't know what the kinnect can do or can not do. But there currently seems to be a bug in rosrecord that scrambles bag files... it's already in the tracker: https://code.ros.org/trac/ros/ticket/3755
I have the very same issue... for a node I have written myself, which definitively publishes two images in two different topics at roughly the same time intervals and which worked some weeks ago not the bag files only have one image topic but the topic seems to contain both images, at least sometimes images from the other topic flicker through, if I just watch the stream with image_view... It's kind of random which image topic will be saved to and which is really the content of the image topic...
A work around is to start a new rosrecord for every image topic you want to record. You can then just give all those bag files to rosrecord play on the command line and it will play them all simultaneously (and then the image topics are working again.. ;))
I hope this bug gets fixed, soon.
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