That weird thing that happens when there are two women on a team

I hope that you all know what I'm talking about and it's not just me, but I've had this experience more than once (over 20 years in tech). Most of my career, I have been the only woman on the team. I found that uncomfortable at first, but eventually, I learned how to navigate it and manage it just fine.

A few glorious times, I have been one of a few women on a team. No issues here - things went great.

And then there are the handful of times where it was me and one other woman on the team. And it's been...tense? I'm not even sure how to describe it. In one case the other woman was downright hostile toward me while being very kind and friendly toward all the guys on the team. Another time, I was on a team, a second woman was hired, and we kind of had our defenses up at first and were very wary of one another. But in that case, it all turned out fine and we actually ended up being very good friends and even went on a trip together.

I'm managing a team now, with two women on it, and it's happening between the two of them. With everyone else on the team, they are both friendly, collaborative, helpful, and kind. But with each other...not so much. They don't fight, they don't complain about each other. But they are weirdly formal with one another and it just feels tense when they interact.

I was trying to describe this situation to my partner and he was just not understanding. He asked me more questions and the only answer I could really give him was that it was internalized misogyny. I had no further clarification for him when he didn't understand what that meant. I'm just having a hard time putting this into words.

I'm not the only one who's experienced this, right?