You mean Witch's Potion? That doesn't involve Wizard Traiborn at all, and none of the supported quests interfere with each other afaik. I ran Demon Slayer from start to finish on a fresh account just a few hours ago without any problems. If you have any non-default settings (bank, ui, any new weird content from recent game updates, etc) or completed any quests/diaries/mini quests (apart from those supported by the script) let me know.
PS: If you ran it on mirror mode, that's something normal. Mirror mode cannot handle many widgets properly, I believe I reported the bug on dialogues about 2.5 years ago and I don't think it was ever fixed.