Wow, that’s certainly unusual and not something I’ve seen before … I’m also not seeing many similar reports from other users.
It’s possible this could be a conflict either with your theme or with another plugin. To that end, would you be able to run through our standard conflict test steps?
theeventscalendar.com/knowledgebase/testing-for-conflicts
Alternatively, you could create a fresh staging site (despite the funny name, poopy.life is a great and free way to create a new WP site which is a “blank canvas” in which you could install only The Events Calendar and Events Calendar PRO) and try to replicate there.
Let me know what you find!