Bootstrap button drop-down box does not pop up

I write the user"s status bar in a separate jsp file, and then include it in other jsp files. But one of the three websites can pop up the drop-down box, and the other two can"t.

  <div class="btn-group">
                    <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown" ><%=session.getAttribute("nickname")%></button>
                        <ul class="dropdown-menu" role="menu">
                          <li><a class="dropdown-item" href="-sharp"></a></li>
                          <li><a class="dropdown-item" href="javascript:void(0)" onclick="logout("<%=logoutPath%>")"></a></li>
                        </ul>
                </div>
Mar.04,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bd4a3f-3075b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bd4a3f-3075b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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