I have created a video on how to recreate this bug, but it is over 10 MB.

Link: https://www.youtube.com/watch?v=GsjhPYlfSC4

When a big dripleaf is grown, and the top is broken off, there remains a "stem". When placing another dripleaf on top of the "stem" from a different angle it was grown, the Big Dripleaf will be floating in an odd way.

Note: This can only be recreated with player interaction.