I have this page with Attitude for one and a half year. When I created this in 2013 everything was correct. I also checked on mobile. Now I discovered that on mobile menu has disappeared. It was okay earlier. Now I can see only the first page with no menu. On my PC still everything okay, there is menu, and I can use it.
Did you customize any code? If not then first of all deactivate all the plugins that you have installed in your dashboard. Then check, it is there still same problem or not because, there may be sometimes plugins conflict. It would be better if you provide your site url too. You can visit to our demo site and its working fine so it must work in your site too.
Thank you for your answer. In the last few days I have reinstalled WordPress and the Attitude theme as well, so code customizetion cannot cause the problem. And I have deactivated all the plugins and the problem is still the same. My site url is: http://velenceimoni.hu/
It seems that you have customized the code. We have activated the new theme and it works perfectly. There is attitude test in your dashboard so you may activate it to see the effect.
We have found the issue that you have added some javascript (form) in the widget text which is conflicting the mobile menu. Better enqueue the javascript either in header or footer.