Hi there,
Thanks for reaching out. I will try to help with your issue.
I can see what you described when visiting your site. I noticed that if I navigate forward one month and then back, the correct events show. But upon loading, they are mixed up like you said.
I am unable to replicate this on my local test site. I would start by working through the troubleshooting steps outlined in our Testing for Conflicts Guide to see if this is being caused by your theme or another of the plugins you are using.
Give that a try, and let me know how it goes.
Thanks,
Sky