I have the exact same problem, alot of stuff has been put in the recycle bin folder, it seems like all files goes to the recycle bin folder even on the cache drive. And then is moved to the wrong place on my shares.
The recycle bin plugin has no control over the files that are deleted. The recycle bin plugin only enables the vfs_recycle option in samba. You may find that windows is creating temporary files that get deleted and end up in the recycle bin. You will probably see that the files in the recycle bin have the same name, but a different extension.