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I'm currently working through a similar issue. Upgraded PG to 8.4.14 but the problem persists. Every time deluge is accessed through the webgui all settings revert to defaults and very annoying. I imagine the settings should be saved in the core.conf but that doesn't seem to be happening.
I am familiar with deluge rather than another torrent client so I'm looking to fix things, might try a reinstall and see if that helps.
I uninstalled it and reinstalled it works again I tried all the others don't like em apart from rutorrent but that didn't work for what ever reason so stuck with deluge, maybe 5% of my download are torrents so no big issues
Finally got around to removing deluge and installing qbittorrent. So far I really like it, similar interface and it just works with minimal configuration. Also doesn't seem to have any trouble with Traefik and Port Shield.