In some circumstances, the OR statement makes the same issue to be displayed multiple on the issue search, list view.

It can also affect boards, showing the same issue multiple times in a single board,.

Steps to reproduce:

1. Open a big instance with multiple JIRA issues.
2. Select Issues > Search for Issues.
3. Select the view List View.
4. Run the JQL lastViewed > -1w OR Updated > -1w.
5. Some issues are displayed multiple times.