Zeroing with the MBTs' coaxial does not work above "1900m". What I mean by that is that, when you try to zero up above that value (1900 included), it will consider that the value is at 100 (or so), even if it displays 1900, 2000, 2100, 2200, 2300 or 2400. This issue concerns every MBT.
PS: Not sure of the category of this issue. {F23424}