Same question from Beth Starr, Feb 14, 2018, never answered
We are running into the same problem
When a subtask is added to an issue in Jira, the Sprint board shows the In Progress issue under the To Do column. I thought maybe this was a browser issue but when Shrink my screen to 50% it still displays under the To Do column. I tried different browsers and it is displaying the same way. The subtasks have been closed and the parent issues are in the status of In Progress so it can't be related to the status of the subtask. You can clearly see the issues are in the status of In Progress so how can I fix this?
*Update The subtasks on our board are "In Progress", same problem.