It sounds to me like it is a bit too round for your particular head.
I tried for years to order a helmet, but could never find one that fit me. I always had a dent in my forehead and yanked it off at the first possible second. I very much hate the mushroom look and I have a large head so it is even worse on me.
I was at the local tack shop for a big sale weekend, and tried on a bunch of helmets with the help of the store rep. She knew the brands and with a bit of trial and error I finally had a helmet that for the first time correctly and comfortably. To the point that I would sometimes forget to take it off for a bit when I got off the horse.
If you have the opportunity to go to a tack shop with a big selection, it is worth the expense to go there and get one - just don’t be that person who spends an hour of time with a store rep and then go buy online somewhere else for $50 in savings.