Need help selecting helmet.

Intro:
I know my heads circumfrence is a tiny bit under 62cm (XLarge helmet).
Today I went to a local bike shop to try on some helmets to see which ones I liked. I tried on a KBC XLarge helmet, it was very tight and too wide. It pused on my forehead and the back of my head, there is no way that helmet will fit me. I tried an XXLarge, thinking that will do, wrong. Same problem. So I go to a different brand (Gmax) and try on an XLarge, it firts perfectly. To make sure its not just that helmet by chance that fits me, I tried an other brand (Cyber). Their XLarge helmet also fit me perfectly, although I wouldn't buy one because its too short, just wearing it for a few seconds fogged it up. At least it fit right.

My question. Why do some brands of helmets fit me (in the same size) and others don't? What are some brands of helmet that are shaped on the inside like the Cyber and Gmax XLarge helmets? Are some models of the same brand shaped differently on the inside?

On a side note, "Hi everybody" this is my first post :grin:. I found this forum a few days ago, I like it.