School issues

[Jhunter5]

My partner's child is 6 and just started back into Primary 2. The problem we are having, and we had it last year towards the end, is that he lines up in the morning when the bell goes and then when the teacher comes to let him in he runs out of the line and back to find mum or dad. Once he is in he is absolutely fine, and there is no crying or tantrums. He just keeps running out the line. I have spoken to him, his dad has talked to him and his mum has spoken to him but nothing is working? I have never witnessed this I just know he is doing it.
Any suggestions why this might be or what could be done to help?

Has he said why he is doing this? What happens once his finds his parent? Is he happy to just go back in line then? What would happen if they said goodbye to him in the line and then left the playground? It sounds just like habit which he is doing because he knows it annoys people.

Why are they hanging around once they've dropped him off?

He wants some extra reassurance, a final cuddle or whatever. While it is probably annoying, I don't see anything strange about it.
Parents all wait till the line goes in at that age, in my son's school.

I suspect the parents who wait until the line goes in don't have clingy children.

If I were the parent of this lad, I would tell him I would would only wait to watch him go in if he doesn't make a fuss and goes in nicely like all the other children.

He comes back, clings into the parent an the teacher has to prise him off. My partner has said buy walked round the building to the gate and next thing he has run out line all way round to him.
He has been spoken to by parents and told he needs to line up nicely but just keeps running out. He has said he does it because he is scared of school.

So... The issue is that he is scared of school, not how he behaves in the line surely. That's what need to be looked at, at home and by the teacher.