Responsiveness for mobile phones suddenly doesn\'t work

When I (or anybody else) is entering my webside from a mobile phone it doesn’t longer act like it used to, even though I have the responsiveness enabled in the theme settings. The site is very big in the mobile and you have too scroll back and forth all the time to the sides to read the full text. And you can´t minimize it either.

I don’t know if there’s something that I have done by mistake in the css that causes this or if it depends on something else. I have no idea what to do about it, hope you can help me. 🙂