How much standard deduction does my dependent claim?

My 22 year old son earned around 23k in wages (w2) last year and i claim him as a dependent on my return. How much of a standard deduction should he take? it says the greater of $1100 or earned income + $350, in this case I believe he would just take the standard deduction of $12,550 but i used the IRS calculator and it says he will claim the $1,100 in standard deduction? very confused