I'm using a wordpress package and a free official theme of its database on my website. After trying to minify my js and css codes a problem just occured and that was unfixing the content bar on mobile mode! I tried other themes but the result was same and I think it' something related to Wordpress core and its js codes. When I want to open a post, it shows a blank black page and I've to move right to find the content bar. Here is the sample of what's going on on my website.
You can also check it on my website: https://raika-edu.ir https://raika-edu.ir/شیوه-مطالعه-درس-ادبیات-فارسی-کنکور/مشاوره