I have multiple things floating around.
Trees seem to be floating at higher elevated levels.
Like a mountain wich is higher than my grass level. The tree should be on the rocks but is floating just besides it.
After accepting a trade the materials get dumped with your banner.
Somehow they just as often end up ontop of the banner and never get hauled away.
Also the leaves of the tree are often inside the mountain when the tree is growing to close to a vertical wall.