If there is no limit listed on my schedule of benefits, can my insurance place a threshold on allowed amount for single vision lenses?

Short and sweet.

My copay for humana vision plus is 10$ for single vision lenses. On my bill for an expensive pair of glasses I got, the single vision component was 265$ retail price, and my “insurance allowed” on the receipt was $105 so I was left with $155 to pay even though my listed copay for single vision is detailed and nowhere limited on my full schedule of benefits.

Of course the other itemization of anti reflective, UV, scratch etc are there. But this was its own item.

Is this just some hidden value I’m left to discover or can I dispute this?