Ran into this problem when I was using the Thrustmater TWCS HOTAS, but after trying to reproduce it, I realised that the issue is not joystick-specific, and can be reproduced with just the keyboard. This is with no mods enabled, no DLCs, no configuration changes, fully fresh game config directory.
What works fine (straight out of the game start, I used the Young Gun one):
- Press M for map -> Press ESC to close the submenu -> Navigate to Mission Offers using the DOWN KEY -> Press ENTER -> Game selects/focuses the first entry in the sub-menu list.
- From above end state -> Press ESC to close the submenu -> Navigate to Mission Manager using the DOWN KEY -> Press ENTER -> Game selects/focuses the first entry in the sub-menu list.
- Press M for map -> Press LEFT to move into the sub-menu selection list on the left side -> Navigate to Mission Offers using the DOWN KEY -> Press ENTER -> Game does not select/focus the first entry in the sub-menu list - the focus remains on the sub-menu selection. Even if you press RIGHT, the focus will not move onto the sub-menu first entry, but on the player name (reset to top view button).

