In the NCO Calc I entered:

Fosc = 32 MHz
Frequency = 1,843,200 (didn't use commas in the NCO Calc, added for clarity here)

What I got in return was:

NCO Decimal = 120795.84
NCO HEX = 1D7DC
Result Rounded Up = 1,843,217.7002
Result Rounded Down = 1,843,202.4414

Our results aren't that much different. The project I developed the NCO Calc for is reading within < 0.02 Hz different than calculated with the NCO Calc. Not sure what you got.