Hi Laura! That does sound frustrating, could you let me know which part of Trello you're seeing that? Is it in the date selector when you're trying to set a Due Date? Or are you looking at the Calendar view?
Could you try from a second browser and/or from an incognito tab with extensions disabled to see if the issue may be related to a browser setting? We have more detail on troubleshooting there here: https://help.trello.com/article/736-troubleshooting-browser-issues-with-trello
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