Hey Chris,
Thanks for reaching out to us!
This is definitely a strange issue to be having. As an initial step, have you followed the Testing for Conflicts procedures to ensure that this isn’t a plugin or theme conflict?
A couple of other notes/questions that may help in determining the root of this issue:
- What version of WordPress are you currently running?
- What versions of The Events Calendar and Events Calendar PRO are you currently running?
- When testing recurring events, does this happen no matter what the interval you set (weekly, monthly, daily) or does it only happen with this particular “every 4th Monday” type of event.
Let me know if this helps. I look forward to hearing back from you.
Thanks!