Want to know more about this op-amp configuration
The problem is that you are assuming that you can achieve stable conditions with positive feedback. You can't. The transfer function is non-linear. Your circuit is a non-inverting Schmitt trigger.

With the response time of the op-amp \$ V_P \$ will always lag \$ V_O \$, the error will magnify and the positive feedback will drive the amplifier to one rail or the other.

There's more detail and maths on page 11 of Operational Amplifier Circuits
Comparators and Positive Feedback by Chaniotakis and Cory. 6.071 Spring 2006.

See also How are positive and negative feedback of opamps so different? How to analyse a circuit where both are present?.