That site is not actually copying content from Wattpad, they’re looking at Wattpad through another webpage. Sites like that are mirror or ‘lens’ sites. They look at Wattpad through a lens which usually carries their own logo, malware etc.
The Wattpad team are aware of these sort of sites and are working on getting them taken down, but they’re usually located in countries that are less caring of copyright law and so can take a long time to get removed.
I’ve edited your post to remove the link - if you click on the site or any links related to that site you are likely at risk of a malware attack, so be sure to do a full threat/safety scan on your laptop/computer/phone.
For your safety and for your readers, you may want to include this message in the summary of your story on Wattpad (this also applies if you write on another site) -
“If you are reading this story on any other platform other than Wattpad you are very likely to be at risk of a malware attack. If you wish to read this story in it’s original, safe, form, please go to (Wattpad User Link). Thank you.”