When upgrading a line of belts that includes belt weaving, say red and yellow belts, both belt lines are marked for upgrade to blue belts if you upgrade from the red line. I thought you could add screenshots to posts but if so I can't figure it out, so I've posted a screenshot to imgur for reference. https://imgur.com/a/4Vimq7G
Top line is the original setup.
Middle line is expected behavior.
Bottom line is actual behavior.