You did the net price calculator or you are looking at tuition - Tuition is $58K but cost of attendance is $79K - meaning room, board, etc. and what they tell you it costs - it costs more - budget another $3-5K more.
Then you have inflation - another 3-5% a year or sometimes more. Some schools lock tuition four years - so you can look into that.
Or are you saying you did their net price calculator - and they are saying your cost including room and board would be $58K -meaning they will offer you aid.?