First of all, great software! Thanks for your work in putting this together!
From a US user...settings are in mi for distance and ft for elevation. When I enter a manual training session, the miles entered are converted to a different number when you press OK. Here's a few sample entries and resulting output: Enter 3.1mi...after OK it shows 1.2mi - enter 5.3mi...after OK it shows 2.05mi - enter 10mi...after OK it shows 3.86mi.
These values suggest the entered value is being converted by a factor of 0.386 - where this factor comes from, I have no idea. It's not even a mi-km conversion factor, which would make more sense. Anyway - my current workaround is to divide my mileage by 0.386 before entering a manual training entry.
When settings are adjusted back to km and m, manual entry works fine.