Should these vendors be tipped?

I’m a little confused on how this works. I’m noticing a lot of the wedding vendors have included a standard 20% gratuity in the cost. Today I went for my trial run at the hair salon and tipped the makeup girl and hair girl. Then I looked at my contract and it turns out they had already included gratuity in my bill. So I guess I double tipped? For the vendors that included gratuity, am I off the hook for tips? It feels so strange not to give a limo driver or hair salon a tip! Is this including gratuity the new thing?