Event reminder doesn't triggered 5 min befor the event.

Information:
phablet@ubuntu-phablet:~$ system-image-cli -i
current build number: 63
device name: krillin
channel: ubuntu-touch/rc/bq-aquaris.en
last update: 2016-09-05 14:09:38
version version: 63
version ubuntu: 20160903
version tag: OTA-13-rc
version device: 20160606-ab415b2
version custom: 20160831-991-38-18

Step:
1. Launch the Calender App
2. Tap 'New event' option on the bottom.
3. Tap on From date and choose today's date (default)
4. Tap on From time and choose time (7 min from current time) and leave the 'All day event' un-ticked
5. Fill in others form (Event Name, Event Details, Location)
6. Tap on Reminder option and choose '5 min' from this list.
7. Saved this event.

Actual result:
Event reminder doesn't triggered 5 min befor the event.

Expect result:
Event reminder should triggered 5 min befor the event.