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I have cases that are on waiting for the development queue till we have been done a build and closed them but the cases are disappeared from the bred even tho I didn't close them.
Can you please investigate why these issues happen?
Are you the board admin? If so please check your columns are configured correctly?
on your board, you you have any quick filters at the top, could these be in use and stopping you seeing the issues?
maybe also check the board filter is pulling in what you need it to