Bug in dragging events in Calendar for Jira

[Allen Chun]

I'm using Calendar for Jira version 1.6.7. I encounter a bug whereby I created an event with dates for example: Oct 5 - 8, then when I view the event from the calendar and I drag to Oct 8-11 the position of the event will change to Oct 7-10. The event will always move 1 day backward. 

Here in the screenshot the borrow from is 08 Oct 2018, but in the calendar it's 07 Oct, 2018

 

Is this a bug from the addon? Because I tried to change the date using the edit form the event changes to the correct date.