UNICON THEME (Mobile) menu icon is not displayed.

Hello,
I had a look at the website on my cell phone.
The menu icon appeared on the home page. As soon as I switch over to an another page
the menu icon doesn’t appear anymore and I wonder why.
When I then return to the home page, the menu icon isn’t shown anymore. What am I to do to
fix this problem?
May thanks for your help and kind regards

picture:
[url=https://abload.de/image.php?img=screenshot_webseitetzjqz.jpg][img]https://abload.de/thumb/screenshot_webseitetzjqz.jpg[/img][/url]

Ticket