Greenhopper Classic Boards Showing Inaccurate Data

When sorted by Version on the classic planning board, Greenhopper shows incorrect statistics. Have a look at the screenshots:

• Real - this gadget shows what 'Time Estimate' really should be: 1563h.
• 15th - This shot was taken Oct 15 and shows 'Time Estimate' of 1075.25h, which is incorrect. Additionally, Time Spent should be much greater than 0 as you can see by viewing the issues in the shot.
• 18th - This shot was taken Oct 18 and shows how 'Time Estimate' has magically changed. No original estimates had been adjusted between the 15th and 18th.
• JIRA_support - useful info on our instance of JIRA.

From what I've seen, the other sorting options on the planning work was as I would expect.