Too Many Calendar Notifications
On my iPhone, I have my daily class schedule on my calendar and I set the calendar so then I receive a reminder for my classes 30 minutes ahead of time. I set these reminders for all my future events however, sometimes for certain classes, I get a reminder for a class that I have for the next day. I went into the calendar to remove the second alert so then I only receive reminders 30 minutes in advance for all my classes, but then it randomly switches back to giving me reminders for tomorrow.
How can I fix this issue so then I only get the alerts for my classes 30 minutes ahead of time?
iPhone 11