Internet using m. in url

[Soph_dw]

I have an Experia Z1 and all of a sudden the internet is using m. so for example m.ebay and it doesn't load the website at all. 

Can anyone help, i need to know how to revert back to www. it's just randomly started happeneing?

Thanks

[Thommo]

Tap on the 3 dots in the top right corner then near the bottom tap on Request desktop screen you may only see the S of screen