Hi @RCMC , welcome to the community!
I've looked into this on my end and it seems that the filter to Due date "Marked as complete" is running fine. It's this filter you are looking for?
Be sure to click on "Show more options" when looking into the Due date Filter section.
If this is still happening on your end, I would kindly ask you to create a ticket with us and allow to impersonate your account, so we can take a look if this happens on our end as well. Here's the link - https://trello.com/contact#/
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