BUD Creates Double Redstone Drops When Activated

While trying to update a Block Update Detector, I discovered this glitch. I searched 14w25b BUD Glitch and found no results, so I figured I would try to post it here. What was happening was when I placed a redstone dust on top of the redstone block in the BUD, it would break the redstone dust and produce two redstone dust drops. To recreate this, use 6 slime blocks(S), a sticky piston(P), an empty space(N), and a redstone block(R) in this formation:

S S S
S N S
S R P

Then, place a piece of redstone dust on top of the redstone block.

And to reiterate, if this is a duplicate, I searched for "14w25b BUD Glitch" with no search results. Thanks!