Good evening Ingrid and welcome back!
Thank you for reaching out to us.
I would love to help you with this topic.
As a first troubleshooting step, could you please provide us with your system information in a private reply ? (following the instructions found in the link)
Second of all, if you don’t mind, could you share with us the iCal link you are importing from as well as a screenshot link of the message in question ?
Finally, are the events importing in batches recurring events by any chance ?
Best regards,
Geoff B.