Exclude finished items having a date from date related filtering

I work with Kanban views selecting items with a deadline, like today, this week, etc. I see some items having a due date which lies before today (or any other filter), so not sure if this is supposed to happen. Next to that, without filtering, items can sometimes say due 297 days in the top row of the item, but when I look into it, the item has been marked finished. Of course I can delete the due date, but I'd rather keep it to track progress etc.

So, am I doing something wrong or is this an underestimated feature? :)