I'm not sure if I should be concerned or not, but I couldn't figure out what was going on so I figured it was worth posting. For some reason, I just noticed that when I enter mission control it looks like there's a small white window open in Desktop 1, but there are no applications running or anything and nothing is visible when Desktop 1 is active.
I've attached a screenshot. If anyone knows why this is happening or if I should be concerned, please chime in. Thanks
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