weather discrippancy

Set up : FS9 + FSreal 2.01. 221+ FSUIPC 3.999

Noticed following to day as frequent user for years of yr program infact I use it exclusively :

Large differences between weather generated/injected by FSrealWX and other weather generators (I tried IVAO online weather and FSMetar)

fe EHAM metar to day low vissibilities( RVR active general vis 350 mtr QNH 1018
FSrealWX doesn't impement/inject this vis condition and QNH is set 1013 while downloaded metar report is indicating vis 350 and QNH 1018.

The other programs are injecting the correct weather in FS9

Any idea ?

Cheers,

Marcel