How to determine workflow.
In the light table mode click on the gear this will open preferences.
From the left column choose processing.
Auto apply pixel workflow defaults what is in the pull down will indicate your work flow.
jaw-dt Set the WB to my camera specific setting daylight ( what it was shot as) on the HDR it is was also fine.
My camera is not set to auto white balance most times is set to daylight.
jaw-dt The white balance on the HDR did not match the originals it was at 6502.
Open the white balance module of an image and at the top is scene illuminate temp. The HDR image it was at 6502 which was different from the three originals.
jaw-dt If i copied the history stack from an original and pasted it to the HDR every thing was as expected.
See manipulation of the history stack link here
Hope this was helpful and not more confusing.