Responsive wordpress

Hello Admin, I am facing a problem with my site that’s hosted on your free hosting plan, My site is totally responsive on 1366 x 768 and below. But when I turn my screen resolution to 1920 x 1080, it starts showing an unresponsive behavior.
I am looking for guidance.

Maybe it’s an issue with the WordPress theme you’re using?

Is there anyway I can fix this issue? even if it’s a wordpress theme issue.!