It has probably more to do with the conversion of internal geometry engine units (cm??) to inches, for display, than how floating point numbers (IEEE 754) are stored in memory!
The conversion is either:
cm * 0.3937007874015748031496062992126 = inches
cm / 2.54 = inches
If the former multiplication is used and that conversion factor number is rounded, to say 0.3937, then you "may" see an error in some displayed calculations! I'm sure Alibre can clarify if this has a possible effect on why the OP may see the issue they see.