You may have noticed that our dedicated testing team are currently going through a number of older bugs to determine whether these are still current bugs. As part of this they are attempting to follow the replication instructions and replicate the issue. Issues that cannot be replicated will be closed with an appropriate message.
If one of your issues has been closed and you feel that this was incorrect, this probably means that the replication instructions were unclear, incomplete, or no longer current. You can comment on the issue with updated replication instructions, and re-open the issue as appropriate.
Now would be a great time to have a look at some of your older issues to check that your replication instructions are clear, current, and complete. You may even be able to close a few issues yourself!