Opinion on Jacket please....

Fellas, I need to hear from some of you experts on these jackets.
I bought the Alpinestars GP pro , this is the first time for me wearing a jacket with the hump on the back. every time I ride the back of my helmet hits the hump and it becomes very uncomfortable after a while......

is it normal that the back of my helmet touches the hump or perhaps this jacket is too small for me ???

do you guys that have similar jackets find it that your helmet hits the hump ??

Thanks

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