The recordings are not 1:1 playbacks of reality.
When you save the track after your mission ended, the game will create an old "TRK" format recording which is missing all kind of things.
It's basically a track format from the ancient days of IL-2.
In newer versions you can completely prohibit TRK recording for good reasons, but I think that's not documented.
If for instance you watch the good old "The Black Death" track which is often used for FPS estimation, you will notice that when the La-5's shoot the Fw-190's, they mostly miss, and they seem to cause no damage, and for sure whatever they seem to "hit" is no reason for the planes to go down. Yet they do. TRK recordings - shitty as can be.
When you save the track while your mission is running, the game will create a new "NTRK" format recording.
NTRK tracks consist of the mission, the plane and pilot skins, the starting condition (positions, speeds, orientation, state) of all actors on the map and after that, all the data that would be sent across the net to other clients if this missions was flown online.
So essentially you get what you need to see the actors at all, you get their initial states, and then you get the same thing you would see if you'd watch this mission being flown from the other side of the world.
Gun/Bomb/Rocket/Torpedo Fire/Drops/Shots have in issue in TD's net replication code.
It's not the Shot/Drop itself that's being sent across the net, but the trigger keypress.
But that trigger keypress is not being sent with each interpolator tick like it happens for the initiator, but only on every 4th net update (or so).
This means that your gunfire might be seen delayed on the NTRK, or it might even be missing at all (like many bomb drops are).
This is exactly the same issue like you get when you watch others playing online.
Nevertheless, when you've hit someone while playing the mission, the hit will "count" in the NTRK (and online) too, because that's being dealt in a different way and only the "shooter" perspective counts, whether or not from another perspective (NTRK, online) the shot hit or not.
Best regards - Mike