Question Why is the output of the op amp designed for this circuit wrong ? !!

[Eveny]

1. Given a fixed value of V1: 0.5V, the value of v2 is adjustable.
2. When 0.5V＜V2＜1V (probably this value, there may be a little difference between up and down), the OUT output is my ideal output value.

Problem: When V2>1V, the output value of out is always close to 2.75V,

I don't understand why?