Sorry for your troubles with this, and thanks for submitting the build. I'll forward this to someone who can potentially do something about it... but if it helps, I had a good laugh when I saw a monk sextuple-wielding UE helmets. New meta inc!
That sounds very strange. Doesn't happen to me. Can you submit one of those builds (label it "bug report" or something like that so it's clear that it's not a final build)? I just tried to create a new build and for me every slot lets me choose the appropriate item.