You would have to inspect form 8995 line by line to see where your anticipated deduction is not being allowed. Line 1 would list your QBI from your interest in businesses, which is combined with your carryover loss in line 3 to arrive at your total QBI. Lines 6 and 7 list your REIT dividends and publicly owned partnership income. Line 12 lists your net capital gains. If one of the amounts looks wrong, you would have to investigate that item further.