I see this all the time with inch values that I enter as whole integers, and then see them displayed as very-close fractions. Clearly there’s a floating conversion error going on with the internal conversion to mm and back. Mostly I’ve just ignored it.
The repeating 9 digits in the machine and stock dimensions could almost certainly be cleared up by rounding to some very small precision – millionths or billionths. The misrepresentation of “13” as 12.99212 is harder to understand, and perhaps harder to trivially fix.
Clearly not a huge deal – mostly aesthetic, but perhaps worth thinking about.