I had a map for DnD with a grid size of 26,727272 and the result was that diagonal movement (which normally should be 5>15>20>30) was 5>10>20.1>25.1>35.1. The .1 wouldn't be a problem, but the second diagonal step doesn't become a larger value. I tried to set the grid size to 27, which fixed it, but it keeps resetting the grid size to 27.00000000000002 for some reason. The weird ruler also happens on a map with a grid size of 26.6 Grid size 28,375 on the other hand caused the diagonal movement to be 5>10>14.9>24.9>29.9>34.9>44.8, which isn't that big of a problem, but still weird. In every case, 1 grid cell = 5 ft