So as you can see from the two screenshots, both the bones have the exact same weight paint. They are somehow linked. In other words, if I update the weight paint of one of these two bones, it updates it for both. How can I unlink them?
As you can see on the far left the multipaint is not checked and checking the auto normalize does not seem to do anything either. It also just seems to be this one specific bone (highlighted with a blue arrow) and it seems to always be linked to the bone I was working on before
Blend file: https://drive.google.com/open?id=1J26x1-2ROqum0nus15W_Fagv848jHuaD