syn, you have a keen eye on detail!
Loaded your flight, spawned the boat 1 mile ahead (via AIcarrier) and here's what I've got:
FSX reports calm weather at the point, i.e. no winds. However, SimConnect reports actual wind of 0.9kts from 93.79 which with the carrier's deck heading of 293.03 results in -0.9 WOD (which is geometrically correct with the given numbers). If the wind was exactly 0 then WOD would be 0, too. By the way, when the boat steams forward, the WOD displays positive numbers, as expected.
So, I've just added rounding of the wind speed and now the WOD is zero, as it should!
Resume. In such rare occurrences (calm weather and a stationary carrier) vLSO may give some unexpected results. The rounding seems to fix the problem, so it will be implemented in all future vLSO versions. Thanks again!