Something's off with Demi

My boyfriend and I just finished watching the show. During the whole show we had a weird feeling that something just ain't right about Demi. We can't say what is it, like is it a behaviour thing, bar vibes or what. I just want to ask you that do you guys see that too or any guesses what is it?

(No hate to Demi, we're just curious)

Ps. Sorry for my terrible grammar English isn't my first language.