Steps to reproduce:

1. Create 2 projects in fresh JIRA instance (eg. project test and project B).
2. Create an issues in both projects (eg. test-123, pb-1).
3. Now create a new filter like this:

   key in (TEST-123, PB-1)

4. Remove the user 'Browser Project' permission of project test.
5. After that, go back to the same filter. An error shown that the key for TEST-123 is invalid and change to issue key 11305. Please see attached:
   

Finding:

• This problem only happen in JIRA 5.2.x.
• Also, tested in JIRA 6 but not able to reproduce it.