recur() function not working correctly?

[telmof]

I'm using Later.js for recurring events. I'm trying to test the recur() function and it doesn't seem to be working properly, and I don't know why. Here's my example:

var schedule_hourly = later.schedule(later.parse.recur().every(x).hour()),
    start_hourly = moment(start_day + " " + start_time, 'YYYY/MM/DD HH:mm');
var occurrences_hourly = schedule_hourly.next(y, start_hourly);

for (var i = 0; i < occurrences_hourly.length; i++) {
    var execution_dates_hourly = [];
    execution_dates_hourly = moment(occurrences_hourly[i]).format('YYYY/MM/DD HH:mm');
    console.log(execution_dates_hourly);
}

Where:

• x and y are values that I can change;
• start_day is in the format YYYY/MM/DD;
• start_time is in the format HH:mm.

With an initial date of 2016/07/20 10:00, x=2 and y=5 I get the following on the console:

2016/07/20 10:00
2016/07/20 12:00
2016/07/20 14:00
2016/07/20 16:00
2016/07/20 18:00

So it's working correctly. I get a repeating event every 2 hours, starting at 10:00 hours that repeats 5 times.

However, if I change the x to 8, I get this:

2016/07/20 16:00
2016/07/21 00:00
2016/07/21 08:00
2016/07/21 16:00
2016/07/22 00:00

Why does it start at 16:00 now? Shouldn't it start at 10:00 like before and go to 18:00 next?