Interesting! This definitely looks like it might be due to an integration or Power-Up syncing those events with cards. Check any calendar-related connections you have, especially those outside Trello's native ones, as connecting to calendars is a pretty common integration. Unfortunately, those screenshots don't tell us much, we'd have to dig a little deeper to investigate this.
If you're still unsure, feel free to open a support ticket, and we’ll help you figure it out!
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