While in the A-7, some of the weapons presets have munitions that cannot be selected. For example:
"AGM" loadout: seems unable to select anything but cannon and laser. AGM-65 "Maverick," "Bullpup," and the 12xCBU are not able to be cycled to with "next weapon."
Same for A-7 "BMB" loadout, cannot select 14x Mk-83s.
A-7 "CAP" loadout: cannot select AIM-9 nor Fuel tank, only cannon and laser.
A-7 "CAS" loadout: can only select cannon, hydra, and laser; cannot select napes nor snakes
A-7 "HBMB" loadout: can only select cannon and laser, cannot select bombs
A-7 "SEAD" loadout: can only select cannon, hyrdra, and laser; cannot select SHRIKE nor Fuel Tank
A-7 "LBMB" loadout: cannot select bombs
Note: when I first got in the A-7 I could select any weapon.