Yeah, what's the problem? that is completely normal.. that usually means you deleted a few files /folders on your "external hard drive" and then didn't "empty the recycle bin"...
whats the problem??
Do you want Deleted items to not go into the recycle bin? just right click and empty the recycle bin..?!
1) Plug in your external drive
2) Delete all the files you see in the Recycle Bin
3) Disconnect your external drive
4) Plug it back in.. are the files gone? Problem solved. If not, please reply to this post.