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Definitely not normal Finder behavior. It looks like you're selecting multiples by using ⌘A. It almost looks like a modifier key is being mistakenly registered as you click on the group, causing the selection to get dropped. I also see a random Quick Look view in the middle of all that, which would indicate the space bar got pressed (or also mistakenly registered).

Does this persist after a restart? Does it still happen using a different mouse/trackpad?
 
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Benjamin –

Same thoughts as Ignatius. Based on file renaming being activated, I'd suspect that a drag is being broadcast as merely a click, perhaps from a stuttery Bluetooth device. But if Quick Look is opening occasionally, it seems like there might be some spurious input from a keyboard or other device somehow. (Or from the main pointing device with custom buttons? We have no indication what the main pointing device is, of course.)
 
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