Maybe you need to see it in person. If you aren’t happy, you can easily have another jeweler adjust the prongs to your liking for not a lot of money. Don’t despair. A bit of a hassle and some stress bud not a permanent issue.
The picture isn't clear enough to see. It's highlighting reflection off metal because that's what cameras do. It's also usually the case that in real life you won't notice it at all. Perspective is everything.
I'll hazard that this is just what slightly thicker prongs look like on a round. The upside is more long term protection for the stone, the downside is they don't 'disappear'. They can be reworked to take a small amount of material from the outer curve.
The problem is that many people want the aesthetics without thinking about the integrity of long term wear. Yes, extremely dainty prongs are pretty, but they have to be maintained with greater frequency and you have to be careful how, when and where you wear your ring.
I have a ring with very dainty prongs...I wish they weren't. I have to think about them all the time. That's not something I enjoy. If I ever redo the mount, I want the extra protection of prongs like yours.
Let's get real life eyeballs on it first.