A quick loosen all around worked for me.
I am also having this issue, was going to email but will try the fix.
I wanted to add in that I have this same issue with mine. Both of my stands are wobbly and don’t sit quite flat.
My board was delivered Feb 28th.
I’ll probably give the screw thing a try and see if that helps.
very slight loosening of the central screw solved my issue
I’m the guy that took the photo shown in the newsletter - loosening the screws worked for me!
Quick report: Loosening the screws worked very well for one and somewhat well for the one of my stands that presented this issue.
I can confirm that loosening some screws helped a big deal. On the other hand, I think I have one stand where one screw was so tight that the threading was completely broken. I noticed this after trying to loosen the screw which had no effect and, taking a closer look, I saw that the two halves of the stand/foot where actually coming apart. Trying to tighten the screw had no effect and I could keep turning and turning that screw driver without any resistance.