Minecraft 1.10.2
Forge 12.18.3.2215
Sponge 5.1.0 Beta 2039
VoxelSniper 8.2.0 Build #449

When using the tree command it now allows you to change tree types, but changing to large trees reverts to the normal size.

Picture: When using any tree command it shows that exactly with the type changed depending on the tree chosen.

its just a display error they should work correctly right?

You're right, it's only a display error. Tested all the trees and noticed the difference in the oak sizes after that. However, using /u with trees doesn't do anything. It returns with the message "There's nothing to undo." I can create a new issue for this if you want.

Yeah the undo is a separate issue and one that I may have to make some changes in sponge to support.