ETA: solved. I removed my personal data in the powerup area but forgot to revoke the app in settings: https://community.atlassian.com/t5/Trello-questions/I-can-t-remove-due-date-on-my-cards/qaq-p/920424
So this issue started this morning. I tried clearing cache/history, restarting my computer, disabling all Chrome extensions, and using incognito. Nothing fixes the issue.
The only thing I can think of that changed is that I enabled the BigPicture powerup. Since someone else had a similar problem to me and used BigPicture (https://community.atlassian.com/t5/Trello-questions/I-can-t-change-due-date-and-time-to-tasks-properly/qaq-p/879087) I wiped my account and disabled it, then did all the above steps again.
If I open up a card that existed before I enabled BigPicture, a due date automatically appears on it even if I haven't touched the date function - this appears to be a due date that was assigned in the past. If I try to remove or change the due date, it flips back.
If I create a new card and open it up, the due date automatically defaults to tomorrow. If I try to change the due date it works. But if I change the due date then try to remove it, the due date defaults back to tomorrow's date.
In case my explanation isn't clear, here's a video showing what's happening: https://www.loom.com/share/913ea33b04c54709a066ec5c294a1541
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