Hi - There is a drop down menu on the site https://www.touris.com.au/ which displays fine in desktop view but doesn't show up in mobile mode. Here are the screenshots for this.
Desktop View https://paste.pics/5c3c5d694971b205c33384e22e173a7d
Mobile View https://paste.pics/64ae44d34b6b4dcb482e913e2f89bf3a