Insider builds and any builds not known to your site will show up as Other. I have several computers running Win10 1703 (build 15063.332) that are showing as Other in my dashboard as well. Once I read this article from Jason Sandy's I gave up on the Servicing Dashboard and used Upgrade Task Sequences instead. Either way it would be nice to get accurate data and to be able to click on the rings to see which systems are being inventoried.