The buttons on ground act like a permanent pressure plate when an arrow entity is on them. Any buttons near the button with arrow behave the same.
How to recreate the bug:
Make a patch of buttons on the ground, I made it 6X6.
Stand in the middle of the patch, on a button and /summon Arrow.
Now walk on any button, they will act like pressure plates and will emit redstone signal.
If you remove the arrow, all the buttons will update. See the pictures for a better understanding.
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Confirmed
Still an issue in 14w08a

Is this still a concern in the current Minecraft version 1.8.1 Prerelease 3 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
remade in mc 1.8.6
see comment on MC-36654
Ticket resolved as incomplete, because no answer in a reasonable amount of time (1+ year), if it still happens, please update the ticket.