Ive got this shoulder skinned really nicely, but in the next screenshot on the forearm, Maya has this random thing were it places random weights were its not needed, and when i try to remove it, it also remove it from whatever vertex position its located. So it would basically remove the weight on the shoulder as well.

https://gyazo.com/ecc34a676eceb72f2a7850e01d22a248

How do i fix this?