Hi, Bradley. Sorry you’re experiencing this.
I haven’t heard of this happening for other users. Do you possibly have some custom code in place somewhere that might be doing this, even if it’s targeting all posts and not specifically the Events custom post type’s posts?
Also, it might be helpful for you to know that — in the event this does happen — you can set the author in the wp-admin edit screen by scrolling to the top, clicking Screen Options, and checking the “Author” box.
You can even enable the Author metabox for Organizers and Venues by implementing this snippet:
https://gist.github.com/cliffordp/24d4ca37f86212ed56a2e8021214d18c
Please let me know what you find out.