Hospital bill

I have a quick question hoping to get answers- before I went to the hospital I had called them twice and both times they ran my insurance and said i was fully covered, didnt have to pay anything.

Then I had my baby and they said I was being charged $175 per inpatient admission after health insurance coverage as a copay and since I was there for 2 days it was $350 total but they were offering a discount of $70 (which i thought you cant offer a discount on a copay??)

Does this make sense?