I've come across a curious bug, or I'm an idiot, though I suppose both are possible.
The Deploy clock is not reducing while in overhaul. I'm not certain as to the conditions, some ships have deployment in red despite being overhauled. And some seem to have been overhauled successfully. I suspect if a ship has a signifcant overage then it's clock never reduces, but don't quote me.
This is happening at Earth, so it seems unlikely that's the problem. The ships come out of Overhaul and automatically go back, only to complete the next cycle, and repeat overhauling again.
I'm attaching the Db, and the ship in question is "SS Survey (238d) - 6k - Mk II 006" in orbit around Earth, in the "SRV Command" Command. As can be seen from the events, it's looping into overhaul, then completing, then re-entering overhaul.
I'll try to narrow this down a bit as this seems like a bit of a goose chase report.
**edit** Upon further experimentation I believe that some SM mode modified ships caused this problem to happen. In effect is a ship is over it's max deploy it can no longer recover it's deployment clock, seems like some logic may be reversed here. This probably can't happen in a normal game, further examination may be necessary.