UlyssesSky
Head Pro
My GG H'cap is 16.6 despite my club h'cap being 19.3....issues with card in hand ? :-(
It's not exactly clear how GG calculates your handicap, even though it's probably safe to say it's similar to the USGA version (not that I know how that works...).
One thing I'm quite sure about is that GG doesn't use SSS (course rating), so if the SSS at the courses you play is different to par, that may be one reason why the handicaps are different.
There may be more reasons, but without knowing the exact method the GG handicap is calculated, we could only guess what the reasons for any difference may be.
Of course 'tournament anxiety' is absolutely a possible explanation as well...