Mosaic Overlap does not factor into Mosaic FOV

I was in the process of creating a set of FOV symbols that represent an assortment of mosaic FOVs when I noticed that changing the overlap percentage does not change the FOV values given for the total field of view of a mosaic. Fortunately it is represented correctly in the preview window. It appears to be a small oversight not to factor in the overlap percentage for actual FOV values for reference.

But the created Mosaic is indeed wrong, as I just found out, I wanted a 3x2 mosaic of Heart&Soul, and it created positions that overlapped correctly in declination, but in RA it was a factor 2 too much, so it covered only half of the intended area.
Given that it is at Dec 60 this looks like some cos(dec) problem?

For reference, here's the created scheduler file (FOV of the camera is 132x100)