False positive from paternity lab?

When I got pregnant it was a short period of time between when I broke up with my boyfriend and slept with another guy. I got an at home paternity test and only tested the other guy, I don’t remember quite how far along I was but it came back a 99.99% match. I was with my ex with 5 years and never got pregnant (never tried to prevent) and all of a sudden I got pregnant so I figured it has to be the other guys. When she was born, I noticed she had dark brown eyes (like my ex), me and the other guy have blue & hazel eyes. She resembles my ex so much but I can also see some of the other guy in her so idk if I’m being delusional. Has anyone had a similar experience or a false positive paternity test? I truly believe she is my exs baby. He’s being stubborn about getting a paternity test though, I want to retest but test both of them this time.