Sorry to say that, but this website is so slow, that it's hard for me to debug. From my experience I would recommend you make sure that the JavaScript responsible for showing and hiding the menu loads and works properly. You can try to load "server:console" to see if there are any JavaScript exceptions triggered. This might be helpful: https://dev.opera.com/articles/opera-mini-and-javascript/
I recommend you first check your website with old Opera 12.16 on your desktop. If you don't see any issues here, please report a bug from Opera Mini and send us a bug ID here (or in chat message).
Trackers are used to track users data down & show ads.
Since Opera becomes a ad publishing company, Opera force users to see annoying ads. User's can't opt out from it.
They may say, Ads are the only way to income. But at least they should give users control over it. While previous version of Opera Mini, any user can turn off ads but while on latest (like version 31) It can't be turned off.
This is happens to me either when I put the phone on airplane mode then turn network services back on or if the phone loses service then it comes back.