Snowblower throwing some snow short?

check the snow ... if there's layers; soft, fluffy layer atop partial melted slush [for example] this is normal.  even one of those machines can't throw heavy, wet stuff very far.  and if it's self-propelled the rate of feed is controlled by the forward speed -- which is fixed -- try disengaging the self-propelled feature and push it ahead more slowly.  -- grampa

Depending on the snow it's working with, that will happen.

maybe you should hire a mechanic to fix it

It will do that if it’s a slushy snow or if the chute is getting plugged up.