Menu's web-item doesn't display

Hi everyone.
It’s a very strange situation. Menu’s web-item stopped display on the work server. It’s is not reproduce on a test server and via atlas-run. If I resize browser’s window - the menu’s web-item will display or More will display. Although, if I refresh the JIRA’s page, the menu’s web-item will miss again.

When web-item missed - it has:

 <li style="display: none;">;

atlassian-plugin.xml

<web-section key="test-section"
name="test-section"
location="test-menu"
weight="20"/>

 <web-item key="test-menu" section="system.top.navigation.bar" weight="1000">
        <label>Test</label>
        <link linkId="test-menu"></link>>
    </web-item>
Also, I tried to use weight="100"/weight="200"

    <web-item key="test-web-item"
              name="test-web-item"
              section="test-menu/test-section">
        <label>Test</label>
        <link linkId="test-link">/secure/Test.jspa</link>
    </web-item>```

Any suggestions?