Created a task with several subtasks. One of them was put on resolved and a green checkmark appeared on the main task site (correct).
But: after changing the status back to new, the check mark still remains.
Exactly what I said. Look at your workflow. Does it clear the "resolution" field when you use the "reopen" transition from "resolved" to "new"? The tick-flag comes from that field.
For more info on workflows and a better explanation that I can give, see https://confluence.atlassian.com/display/JIRA/Configuring+Workflow
When you change the Status, you have the possibility to also change the resolution. If you don't change the resolution it seems to change automatically.
But now I see: When you change to Status "Back To To Do", then you have the possibility to have the resolution "Done". That does not match,
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