Unless your fight was against something that can't fire back (say a convoy or something) then your naval unit will have taken some return fire, costing it organisation, so it won't still have all its org.
Why would taking fire reduce organization instead of strength? Crew assigned to a compartment don't get scattered under fire like land units, there's no place to run to. Also places like engine rooms, turrets, magazines and the bridge are the most fortified locations on a ship, while non-vital compartments are likely unarmored at all (the all-or-nothing armor), so without damages that disabled their assigned compartment or damages in other compartments in need of extra damage control crew, they're unlikely to get lost or hide themselves on the ship.
Maybe you're looking at it the wrong way.
ORG isn't the ship itself but the crew on the ship. Getting under fire, losing badly, ship getting hit whatever, all causes a lost of organisation on the crew, even if they're normally well-trained.
Those necesitate damages to the ship, which would be covered by strength, if that's what organiation on a ship represents then it's pretty redundant. And again crew on a ship are not going to be scattered in the manner of land troops under suppressing fire, you'd need to damage the ship to do that.
What I meant is that a ship might be at 60% strength but 0% ORG, or at 10% strength but 50% ORG. A ship might be unable to take part in combat but is far away from sinking. A ship might be able to shoot back fine, but one more hit would sink it. ORG is sufficient for me to model the difference between the ability to take an active part in the fight and not being able to be more than the cannon fodder.
Still there's no plausible reason for a ship without crippling damage to be unrendered to fight because of disorganization that takes weeks to sort out. While there are occations where a ship that's not crippled fails to fight, like confused by orders or mechanic troubles, those would be sorted out in no more than a few hours and the ship would 100% recover assuming it's not damaged in the mean time, which are nothing like the org in game, and there are other occations where it's caused by physical damage to the ship, like damaged radar, rangefinder, rudder, propellers, etc. , they should not be able to recover without drydocking the ship, unlike how org works in HoI.