The most common reason why your email links are not going to the landing page but rather redirecting to your website, it's most likely because the campaign hasn't been launched. 

If you're testing your campaign before launch, any links to other steps on the timeline will not work yet because the campaign is not yet active. The links will work correctly once the campaign is launched. 

NOTE: Make sure that your landing page step is enabled as well to ensure it works once your campaign goes live.