Equip a primary weapon in the arsenal, equip a secondary pistol and attach a suppressor, equip a launcher.

Save the loadout, and check how many magazines you had for each weapon. Also make sure to check if the pistol had a suppressor/silencer.

Load the saved loadout from the Whitelisted arsenal, it will be missing 1 magazine for the primary, 1 magazine for the launcher, and the silencer/suppressor for the pistol.

Now go back to the main menu, open the Virtual Arsenal, and try loading that same loadout. This issue will not occur there.

For the "M14A1/M1918A2 bipod bug":

Just save a loadout with one of these guns equiped with their respective bipod, and then attempt to load said loadout.

Worth mentioning that this bug can be frustrating, and rather severe when it happens with the M72 LAW (in case the player did not save the loadout with at least one spare magazine for the launcher, since it is a disposable launcher which should not require additional rockets to work)