I would agree something seems wrong with TT calc.
your capital loss carryover is being reduced by the 1231 gain and then you get a $3,000 capital loss which is proper. but then TT is also treating the 1231 gain as passive income reducing your passive loss c/o which seems its double counting.
example
10000 1231 gain
12000 passive loss carryover
30000 capital loss carryover
so it would seem the c/o's in total should be 32000 further reduced by the 3000 capital loss allowed so you should end up with
12000 passive loss carryover and 17000 capital loss carryover but TT is coming up with
2000 passive loss carryover and 17000 capital loss carryover
