Playing on .18.21-0, Krastorio2 0.9.13 (though I doubt it matters)
If I am checking what my loaders are set to filter, I left-click it to bring up the loader filter UI. If I click another loader without clicking away or otherwise closing the first filter pop up, the pop up changes to reflect the second loader's settings ONLY if it has filter settings -- if the second loader has no filter settings, the original loader's filter window does not disappear, nor does it change to reflect an absence of filters.
I click loader 1, which has a filter. It pops up as it should. I click loader 2, which has a different filter, and the loader filter window updates, as it should. I click loader 3, which has no filters set, and the loader 2 settings would still be left up, suggesting loader 3 is the same as loader 2.
Obviously, I can click somewhere else or close the pop up before checking a loader for settings, but the fact that it does update in certain scenarios and not in others has misleading results.
Thanks, love the game, Hail Satan, etc.