sliding patio door lock

A home owner from New Hampshire says:
When the lock is in the locked position it can be opened about 1/4 inch. Is this normal and if not, how can it be corrected? Thankyou!
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Bob from SWISCO responded:

I don't think this is normal. It suggests to me that either the deadbolt isn't extending as far as it should, or there's a problem with it connecting to the keeper. Is this an old Andersen lock, or a new one you purchased from us? If it's the latter, you could try re-installing it to see if that helps. See the video below.

How to maintain a sliding glass door
How to maintain a sliding glass door
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