Hi,

From the screenshot you sent, it looks like you opened your site in the in-app browser of a social media app (such as Facebook or X). The issue occurs because the banner ad at the top of the header contains content that is wider than your site, which forces other elements to adjust to the ad’s width.

In this case, please make sure the ad banner you insert is compatible with mobile devices, and then check again. You can also double-check by opening your site URL in the Chrome browser. I’ve tested it there and did not find any issues.

Regards,
PenciDesign.