Hi,
100% accidently I added a tag with a space at the end (but, at that time, I had no idea about that space):

And it took me few hours to get rid of this :) since Diffractor trims that last space when showing the tag:

So I was trying:
-"with space"
but of course it didn't work.
Finally I looked inside the file and noticed that there is a space at the end of the tag :)

Thanks.