I have 2 1099-R same company 1 = rollover not taxable 1 taxable; after entering rollover I ended up owing over $4,000 why? For 2018

A rollover should not be taxable but Turbo tax is counting it & my RMD.  I had 2 from the same company one taxable & the big one a rollover non-taxable.  It is being counted as income.  Why?