Those are your differential's spider gears and no that's not normal. The good news is that they are inexpensive to buy and simple to replace. They don't need to be set up like the ring & pinion gears do. You might even find some cheap but good replacement spider gears at a 4x4 shop that removed them to install a locker.
Or replace them with a lunchbox locker like the Powertrax No-Slip which is relatively well behaved on the street and awesome offroad.