I am updating an existing project that has worked great for High Sierra for many years. The view loads correctly and looks as always:

Then, after I open the popup and close it again, the view moves things, turns things around and, as a rule, looks very crazy:

Notice that the Info heading goes down to the bottom, the text elements on the left side are reversed, and the date and drop-down text are flipped. Mouse interaction seems to be very scrambled when this happens.
I'm not sure where to start with this solution, who has any ideas?
This is using xcode 9 beta 5 and High Sierra Beta 6.
Update: this is also in xcode 9 GM and High Sierra GM Seed
Update
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