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Big gap above new frameless shower door? - frameless shower installation

I had just installed a frameless shower door. It is 3 / 8 "thick glass, with a sign on the right side and 30" door. It is a head-to head the panel, which extends above the door, frameless glass, and then joins the two walls attached. His goal is to obtain resistant panels. There is a gap above the door and under the head seems too large. It is 5 / 8 "wide. I can your fingers all the way through it said. The installers that the gap to the door, but I think it should be about 1 / 8". This is the first thing I noticed with my new door. Is this an appropriate facility (normal)?