Could it have been auto-sync? Just noticed you can enable in in Lightroom 5 when 2 images are selected, then flick the 'switch' next to the sync button. Doesn't sound like it to be honest.
Edit - as I was messing with it my pics started weirding out too! Grrr, lost a bunch of photos I had rated and before I remembered I had turned this on. Also reset the clarity setting for a bunch of pics as I was going along.
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