Gogs wrote:

How important are they would I get away with one side out, I notice
when they have done the back door, they have done 5 fixings aside, 3
bottom and zero top...

Are you suggesting having no fixings at all on one side? If so, don't
understand why all the fixings are apparently fouling the locking
mechanism. And, no, that wouldn't be a good idea if you want
half-secure door.

David