Home Interest Deduction

I entered my home(s) interest into turbo tax and the deduction is no the amount I entered.  I have a main home  with the original loan and a refi of that home (same lender).  I have a qualified second home (RV) original loan.  The interest being deducted is 80% less than what I netered.  The value of both is less than $750K.  I went back to last years taxes and the same thing happened when I enterd the interest for the original loans for both homes.  What am I missing?