I'm having this same problem. All rounding is fine. It seems my Category C / short-term 1099K sales are not being carried through to the actual 8949. I have a bunch of Crypto transactions that are filling the form - so dunno if that's the issue.
No matter what I do, I can't get the sales info I enter in the "Stocks, Mutual Funds, Bonds, Other" section to flow through to the 8949.
My category F / long-term transitions are flowing through just fine.
So the error is correct - only my Category F / long-term sales are mapping back to the 1099K.
