your character has a right hand and a left hand.
WHICH MEANS THAT U CAN EQUIP 2 DIFFRENT WEAPONS AND ATTACK TWICE IN BATTLE!!!!!!!

This is not good. you'll be able to attack 2 times in one turn.......

HOW CAN I FIX THIS??

There is an event command that can turn off various equipment slots. I think it's System. Which hand to turn off depends on whether you want everybody to be right-handed or left-handed.

The downside to this is this makes shields not possible, unless you used shields as accessories. Though that would mean equipping two shields would be possible, so you'd probably want to turn off one of the accessory slots if you still wanted shields.