I actively use MCP6001 in my projects. Study the text of the model. It says that this model is for Pspice, and other programs may need to be improved. Once upon a time, I made a revision for LTspice. I also made a model in LTspice syntax. I compared the original and modified model in the SIMetrix program and got a good match of the results. I have attached a modified model to Qspice. For comparison, I used the built-in model.
6001.qsch (9.9 KB)