I’ve just remembered about a bug that has been around for ages but I keep forgetting to post it.
So basically in your squad you have your 3 mercs. To make it easier to explain lets just call them F1, F2 and F3. If you finish a game using the F3 merc, you start the next game with your F3 merc. Only it doesn’t show that. When the new game starts the F1 merc is highlighted so you think you will spawn as that merc, but when you actually spawn you’re actually using whatever merc you finished the previous game with.
This bug only happens if you use the same squad in both games though. If you rotate your squad around then the second game will default you to your F1 merc as you start.