I have never had it stick - entirely, but I note there is a very good ruber-type seal around the hole as well as (I think - eyes are not as good as they never were anyway) a small door or flap.

My supposition is that your particular nozzle may have locked against the seal somehow. I would suggest gentle rotation in the future - and will watch for this to happen myself.

I have experienced at least one pump pressure problem - where the pump almost will not (pump) because of the apparent back-pressure in this system. Most seem to handle it fine, but one self-serve station just refused to give me fuel - I had to really work at it.

Jack

Eschew Obfuscation
Avoid pompous prolixity
If it ain't broke, fix it until it is.