overage in HSA contribution not true

I’ve seen this brought up quite a few times.  I have a qualifying HDHP and had healthcare only for myself from Jan-May. I had a baby 05/31. She is on my plan June-December.   I’ve only had contributed 3660.00.  Per the IRS website, max contribution for single is $4150 and for family is $8300    So HOW in the world am I over $1700.  Telling me I will be fined 6% until I withdrawal it as a non medical expense.