Unable to add Grid values manually in Adobe XD

I started using XD not long ago, but it is already quite annoying.

What I want: 12 columns of 68px, with gutters of 24px, and 2 margins at 100px, in an artboard that is 1280px. Now, if you want maths, we have: 12*68+11*24+2*100=1280. Seems okay for now.

The best that XD can give me is: 12 columns of 75px, gutters of 16px and margins of 102px, still on an 1280px artboard. Which is also 1280 (12*75+11*16+2*102=1280).

I tried setting each values, but XD loves to put my margins width at a nice 102 or 104, or else changing the column width. I really wonder how I can enter the values I want, and not get random ones each time. Does anybody have a solution ?

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