Continue the interview process or stop?

I have been interviewing with this company. Recently, I had my third round and today I received a call from HR. They said my third round had mixed reviews, but based on my other two rounds, they would like to go ahead with my final round. After hearing this, I don't think I would join even if I get an offer. I don't know if I am being too egotistic, please shed some light.

More context: My LWD is just 10 days from now and I said I have counter offers. I'm not sure if they are saying this so I don't negotiate too much, although my first two rounds were indeed better than the third round. So yeah, there's that.

Offer: 18L base + 1L PF + bonus (0-15%) YOE: 1.5