Always making faces?

So I’ve gone on three dates with this guy I met on a dating app. I like him so far, he seems nice and he’s really cute and we have stuff in common so far. But it seems like if there’s any pause in the conversation etc he starts making “funny” faces. He says it’s him just being himself and it means he’s comfortable to be himself around me, and that he’s just weird. but it kinda just makes me feel like he may be a bit immature? Like we had a nice moment on the third date and directly after he stuck his tongue out me and made a 😬 face. So it kinda just makes me feel like we can’t ever have a genuine conversation. I asked him about it and he just said he likes to do things out of the box and if he doesn’t do stuff like that than he’s not being himself. am I just overthinking it?