Time Estimate & Time Remaining Inaccurate in Planning Board

This issue is raised from https://support.atlassian.com/browse/JST-12771:

When viewing the issues in Planning Board with Version mode, the statistics is as below:-

Time estimate: 105d 5.5h
Time spent: 15d 7h 29m
Time remaining: 40d

If switch to another mode such as Component mode, the statistics is as below:-

Time estimate: 62d 7h
Time Spent: 16d
Time remaining: 1d 2.5h

The statistics for total issues and all statuses is the same:

Sub-task: 72
Total Issues: 96
Task: 24
To Do: 4
In Progress: 2
Done: 90
Unresolved: 6
Resolved: 90