Sometimes the grid, while expanding, doesn’t show in a small’ish area. Something like 5 x 5 (not a square though). Scrolling away and coming back resolves the issue. Seems to only happen after the Stetlitte is placed and the zone is expanding.
imgur / FOplqQE
If you want a screen shot, fill in the blanks above.
EDIT: I forgot to note, I’m using the prestige that gives a bigger stetzone!