Hi ​@Morgan24120! Thanks for reaching out!

Your calendar connections shouldn’t effect how notifications are sent - However the one thing I would check to see is if your events have both Basic Notifications AND Workflows enabled. Sometimes both would be turned on by mistake, but in reality, we would want to use one or the other. Th editor in the event would look like this:
 

Using workflows over Basic notifications are the preferred option, so you can turn off the basic reminders like so:
 

Give this a shot and let me know if both were turned on! If not, theres more we could look into.