Very original and interesting puzzle! There are some weak points, like not marking already solved until restart, or some confusing puzzles (like on screenshot) (they are generated, am i right?), but this is really wonderful and smart game!
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Yeah, a glitch was found after submitting that is causing that. I tried to fix having floating blocks in the solution, but as a side effect I sometimes accidentally assign loose blocks to sides that aren't in the puzzle causing that. That's also the cause for my warning on the game page for the level select puzzles, but for random puzzles it is just the luck of the draw if the issue comes up or not.