Perhaps this other case is related...
This time, it's a Quick Load after a mission was aborted (exited), I hit F9 to reload the campaign.
On the screenshot, we see that the Heracles transport is displayed more than 1H to it's target, yet still being marked as "ready to drop soldiers".
Unpausing the game doesn't correct the display: the Heracles is still "ready to drop..." and at the same, shifted place.
Selecting the target again, cause the transport to move toward it, and the status is then updated to "enroute to a mission"