@ not working as vim command with Swiss keyboard

I seems to have something to do with the keyboard. I am using a Swiss Keyboard (Schweiz, deutsch) and here I have to Press Option-G to write a @.

I change the keyboard to English and here it works as expected. If I press Shift-2 to write a @, it is recognized as a vim macro.

The key event test script Javascript Key Event Tester shows following differences:

Swiss keyboard (pressing Option-G):

keydown  keyCode=18        which=18        charCode=0        
keydown  keyCode=71  (G)   which=71  (G)   charCode=0        
keypress keyCode=64  (@)   which=64  (@)   charCode=64  (@)  
textInput data=@
@keyup    keyCode=71  (G)   which=71  (G)   charCode=0        
keyup    keyCode=18        which=18        charCode=0        

English keyboard (pressing Shift-2):

keydown  keyCode=16        which=16        charCode=0        
keydown  keyCode=50  (2)   which=50  (2)   charCode=0        
keypress keyCode=64  (@)   which=64  (@)   charCode=64  (@)  
textInput data=@
@keyup    keyCode=50  (2)   which=50  (2)   charCode=0        
keyup    keyCode=16        which=16        charCode=0            
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