I've run a sim on a specific game about 30x times. 400 million rounds. Why am I seeing different results?

CVdata v5 shows a different starting advantage then every other calculator I've used. Including the Qfit online calculator. Why are the results so different?

6D. H17. ENHC (Dealer BJ takes all). Double any two cards. DAS. RSA. Rs3 ( 4 hands total). Full ES. (Yes, full ES)

CVdata shows player starting disadvantage = -0.31. Qfit online calculator shows player starting advantage = +0.085.

Qfit calculator here: https://www.qfit.com/calc.htm

Any info would be greatly appreciated.

-Fringe