I have encountered a problem that when I try to manually change the brush size (by right clicking the brush size number), krita will sometimes automatically jump to changing the name of the current layer I am working on. This seems to be happening randomly. I don't know why this is happening and I am finding it very annoying to deal with.

Well, I've never heard of that before, so it's a bit hard to see what might be up. Maybe record a video (of the whole krita screen, and make sure to include the cursor in the video) and with that make a bug report? Then we can begin to try to figure out why this happens in your workflow.