Am i in the wrong here?

My GF is 32, I’m 24 years old. We’ve been together for a year and a half. She had a kid when she was 19 and has a daughter that’s 13 years old. I’ve always been OK with it as I knew she wasn’t going to be a virgin every other girls i’ve been in a r/ship with have kids. Well recently I found out that her daughter is mixed so black and Asian and her child’s father was black. I don’t know why it bothered me but it did. She always talked about her daughter and she made it seem like her daughter was fully Asian she always said she’s the same race as us and she would say things like “Asian girls do this” and “Asian girls do that.” I felt weird that she was saying those things because she is fully Asian but the baby daddy is black. It don’t matter but it did bother me a little.