Hi @John Chanter - welcome to the Atlassian community!
As Cinthia has mentioned, the most likely cause of your issues going missing are either your filters, issue sources or exclusion rules, so they're a great place to check.
To help you narrow the problem down, you might like to try out a new feature called "Find Your Issue" which we've recently released. It should help identify why your issues are disappearing when you change the status.
To use it use it:
1. Click "Plan settings" -> "Find your issue" in the plan sidebar.
2. You can then put in the issue key of any issue which you expect to be in appearing but isn't - for you that would be any of the issues that have disappeared after you've changes the status.
3. You'll then get some information about why it isn't showing up and some guidance on how to make it appear.
Hope that helps, and please feel free to let me know if you run into any troubles using it.
Cheers,
Daniel
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