[Konstantinos]

pawn Код:

new WeaponData[MAX_CUSTOM_WEAPONS][E_WEAPON_INFO] =
{
    {"Micro-SMG", .. }, // WeaponData[0]
    {"Desert Eagle", .. } // WeaponData[1]
};

The value you assign is not same as the index.

WeaponObjects[0] is 1 (weapid is 0)
WeaponObjects[1] is 2 (weapid is 1)

What you need to check is the value of WeaponObjects[weapid], not the index (in your case: weapid).