You are right, when I manually set the VOR's to ML and SY, that both have a range of 199/200 nm, I lost ML after about 110nm.
In a General Aviation flight (or the CS 737) I will often follow an ML radial until I pick up SY signal and then follow the radial to Sydney. SY comes into range once I am about 195nm from ML, so I know the range of both is about 199/200

I guess there is something wrong in the coding.