A comparator facing to one the glass/redstone block will cause rapid clocky updates. I didn't see anybody mentionning the fact of facing to blocks (And not only facing like the dropper for exemple)
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And of course if the dispenser is already receiving a constant signal, it will fire as it reacts to every redstone update caused by the comparator.
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Duplicate of MC-846 and MC-6077, please use the search function to see if your bug has already been submitted. Currently over 45% of tickets are being closed as duplicate.
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I already saw them. But they were not mentionning the fact of facing towards the blocks I've showed.