• What I expected to happen was the item frame is stationary.

• What actually happened: I placed map to item frame. I walked to left, then the item frame moved the same way, so it don't move at screen. When I walked one block, the item frame jump (looks like teleported) back to original place. But the frame still remained in the original block, at least half full. Frame overlaps into another block, of course.

• Steps to Reproduce:
  1. Join some server. It hapenned to me on bukkit server.
  2. Place two glass panes next to each other
  3. Place item frames on glass panes
  4. Put map (the other than empty one) to item frame.
  5. Walk to side.

The gif image is how it would like.