Whenever there is an issue with the instance, any experienced JIRA administrator will always have clues on where to look first to fix these problems; however, there is a built-in tool called Integrity Checker that can be used to identify any possible problems with the tool. Perform these steps to use Integrity Checker:
On the next screen, the system will display the list of problems with the configurations found in the instance. You can tick the Fix All checkbox and click on the Fix button to resolve these issues. Alternatively, if you know the actual reason behind these problems, then you can resolve them manually and run Integrity Checker again.