This is an issue for us as well. If you've upvoted here, please review this related issue and upvote there as well.
https://support.workfront.com/hc/en-us/community/posts/115004809754-Issue-In-Scrum-Kanban-View-when-a-task-status-that-requires-approval-is-selected-or-when-a-card-is-moved-to-that-sta...