Szia Shannon,
Thanks for using our plugins and welcome to the forums! Let me try to help you with this.
The events are created in the database. They are not files in a folder, so you cannot delete them in a way you delete file. You would need to go into your database and delete the entries for the events there.
As a first, before digging into the database, I would rather recommend you a plugin like Bulk Delete to help you remove the unwanted events.
Let me know if that helps you.
As for the why, to be able to help you with that, I would like to ask for more information.
Could you please explain in detail, maybe step-by-step what you did when that happened? Was it an import or you created a recurring event? As many details as you can share. Thanks!
Also please share with me your system information based on this:
https://theeventscalendar.com/knowledgebase/sharing-sys-info/
Looking forward to helping you solve this.
Cheers,
Andras