I've just made some changes to bug 8991. However for some reason https://bugzilla.redhat.com/bugzilla/show_activity.cgi?id=8991 lists these changes as being made in 2001-03-14 23:54:28 - a year and a half ago!
Please try same changes in new bugzilla at https://bugzilla.redhat.com/rh-bugzilla-beta3/show_bug.cgi?id=8991 and let me know if this problem still occurs.
I am not longer a member of the "editbugs" group on the test Bugzilla, so I can not test it! Also, the changes are already there (and I've got permissions problem when I tried to change them back before trying them "forward" again). https://bugzilla.redhat.com/rh-bugzilla-beta3/show_activity.cgi?id=8991 still shows the dates wrong, but this is probably just the bad data propagating to the new installation and does not really say whether the bug is still there.
*** This bug has been marked as a duplicate of 24695 ***