I might be able to kill two birds with one stone here.
I’m going to guess that this sensor is Zwave since it’s a Fibaro. The Zwave binding will supply its own State Description to the Item behind the scenes. This can cause problems that is not related to this thread so I won’t go into it. That’s where the “Open” is coming from.
I’ve been told that this “injected” state should be overridable by setting a State Description metadata of your own (except in the case of that problem).
If I understand correctly, you have entered your own State Description Pattern but it’s not overriding what the binding has provided. Correct?
I believe in this case the binding is providing State Description Options. What happens if you move the contents of your .map file to the Options field of the State Description?
NOTE: I’ve found sometimes it takes a refresh of the browser to pick up changes to the State Description metadata.