Hi Anna. Sorry you’re experiencing issues still.
There might be some new updates available. Could you please make sure all your Modern Tribe plugins (and WordPress core) are at their latest versions?
Once you verify you’re on the latest versions, please test to see if the issue is still happening for you.
If it is, please follow our Testing for Conflicts Guide and see if that helps narrow down the cause of this.
If it doesn’t, please play around with the WordPress timezone settings (example: if set to a city name, switch it to a UTC offset instead).
Please also share your System Information and the iCal feed URL. That will give me a lot of extra information to help diagnose the problem.
Let us know what you find out.
Thanks.