Inspector and Flyout QuadCurve EQ have fixed scales of 0-18. They do not change.
When Console View QuadCurve EQ grid is set to Options > Plot Resolution: Auto, it cycles thru 4 scales:
0-6 default
0-12 triggered by a Gain value of 6.7
0-18 triggered by a Gain value of 12.6 (should trigger @12.1?)
and 0-24 triggered when 2 highly set Freq ranges overlap, typically one @12.8 and one @17.7.
The last scenario will cause the Inspector and Flyout EQ graphs to go off screen.
Theme Editor only includes the first 3 scales so if you repaint them, the 4th one won't match.