Mobile V. does not save updates

The site always worked great. Perfect. On the computer or on the smartphone. But recently there is a huge problem. I always edit my website on the computer – but when I checked my website via smartphone, I was scared. NOTHING has been updated or saved, which is visible on the computer. Only old things are displayed in the mobile version. No new texts. No new settings. No changes. No new pictures. Even my old admin picture is inside, although everything is updated on the computer. This is extremely annoying. Why is that?