Every event gets a 15 minute notification automatically

[RozvM]

As stated in the title, every event has a notification 15 minutes prior to it:

I'm using this configuration, ran install and startSync functions multiple times, all were successful:

var howFrequent = 15;
var onlyFutureEvents = false;
var addEventsToCalendar = true;
var modifyExistingEvents = true;
var removeEventsFromCalendar = true;
var addAlerts = "no";
var addOrganizerToTitle = false; 
var descriptionAsTitles = false;
var addCalToTitle = false;
var addAttendees = false;
var defaultAllDayReminder = -1;
var overrideVisibility = "private"; 
var addTasks = false;
var emailSummary = true;

What am I doing wrong?

[RozvM]

Had to manually remove the whole calendar via the Google Calendar UI then reinstall it via the script.