The bort numbers are broken for me, as you can see here.
This bug is not the same as what happened in the first 2.1 release, as I still have it in 2.1U1.
Also this bug is present in my 1.5 install, ever since the dynamic numbering system was introduced. (I just never got around reporting this here...)
I deleted the CoreMods liveries and repaired, didn't fix the problem.