Sub-task rank on Work tab doesn't mirror actual sub-task rank within issue

Reproduce steps:
1- Created new issue (type- story)
2- Added many sub-tasks
3- Within issue, re-ranked items to match business priority
4- When viewing in work tab in Jira Agile, the sequence is NOT:

• the sequence displayed in the ticket
• the sequence it was entered
• any other sequence we can determine

Sprint team must open ticket to see priorities, which defeats point of board.

Found in: JIRA Agile 6.3.13.1, Jira Version: v6.2.3#6260-sha1:63ef1d6 (installed by us in AWS cloud)

I've see other tickets here, but most of them are closed from prior versions... I'm guessing this is a duplicate of another request, but couldn't find an open one to comment on.