I expected to stop into the glass, go to the stairs(down) and at the plesureplate.
It should jump infinity at the stairs(how was hapened somes times).
Some times when you shot with a dispencer at a glass pane the block with you shot will go over the glass.
Steps to Reproduce:
1. Put a dispencer and power it somehow.
2. In front of it put a glass pane wall.
3. In the dispenser put items(I put minecarts with MCedit becauze the minecarts are don't stock and I can show what happens evry shot).
4. Shoot with despenser several times and the block will go over the glass.
I take a video when I discover it: http://www.youtube.com/watch?v=NxZYszRRoaI&feature=youtu.be
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The first screen shot is using arrows - they are not affected
The second shows carts in the air (jumping), as the submitter describes.
The third is steps removed - no jumping - steps make the carts jump.
This final one shows removed steps and added pressure plates
This is NOT a dispenser bug, I don't see it as a bug at all, the cause is the steps making the minecarts jump not the dispenser (drop carts on steps using Q-key and the carts jump), sometimes they jump over the glass (try making glass higher if you want them to jump but not over the glass). Replace the steps with dirt the carts don't jump. If the result your after is activating the pressure plates remove the steps and place your pressure plates there. If your trying to make them jump up and down on the pressure plates, they wont.

@Owen Murray: Good point.
Resolved as duplicate of MC-1720