I have ruRU localization, so maybe problem is in that.
Vanilla quests are disabled in filters but they are still shown as incomplete quests.

Decided to ask because didn't know if this is a bug or still unimplemented. Then the issue is closed. Thanks for your hard work.

No problem! Glad it work. Sometimes it's because Blizzard API is slow to send out a response :(

Not all Legacy quests have their appropriate filter attached to them at the moment. This is because when we originally entered them we didn't have questing trackable. So we never went back to fix them. Quest tracking isn't something that should be on 100% of the time due to some quest always showing up (dailies, weeklies, breadcrumbs).

In the near future, we will tidy that area up and get proper filters on them.