I don't think you're experiencing a bug of some sort... let me explain. The shield is made of four DIFFERENT parts in total. The wood part, the perimetral part, the disc part, the handle (type 1) and the second handle (type 2). In order to create a shield you have to put toghether this exact components and just one for each. You're handle problem, I think, comes from the fact that you're trying to put toghether theese pieces in the wrong order or that you're trying to attach two of the same handle... try to hit the heated handle (the one that appears after the disc) another time and you'll get the second handle (type 2). In that case that one will surely attach to your shield. Don't you worry.