I don’t remember if I’d discussed this with our or someone else. Basically the default sort order needs to be fixed. Currently it behaves not like an active sort than a default sort. Anytime you change a feed sort order, it will update the default sort order. This may also explain part of your previous issue with sort order resetting. If you change the sorting in any feed, it ends up changing the sorting for all feeds, but may not update the UI to reflect that the sorting mode has changed.
I need to fix this. I’d like to have default sort behave properly, and add a setting to remember the last picked. I also need to fix the issue where all feeds share one sort mode.