Thanks Nic. Sorry for not feeding back sooner. Bit a of rookie on JIRA, coupled with trying it out on a big project has made this a teep learnin curve. Finally managed to work out how to find those missing issues. Thanks for the answer though.
As Nic said, it is highly unlikely that you have lost any issues. My guess would be that the group you have removed provided the appropriate permissions to see the issues in the first place, maybe this is the direction you need to look at.
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