For an entity which is not docked (ship or station), power consumption is doubled from what it should be according to the reactor "Consumers" panel. In the build info, consumption for "this entity" shows the correct value, but actual consumption is double that (plus any docks). The value for "w/o docks" shows the actual consumption, which includes the doubled amount. (I believe this item should actually read "w/ docks" or "with docks" since it appears to also include docked entities when applicable.
This does not occur in the Release version 0.201.142. It does occur in 0.201.146 and 147; did not test versions in between.
It appears that the entity (mothership/station, if it has docks) may be counting itself as an additional docked entity, effectively doubling the power consumption of "this entity".