Clickbank Hoplink Problems

When I create a link and paste in my Clickbank hoplink via WordPress page editor, the link ends up taking me to another page on my own site.

I tested by creating a normal link to another website and it all works well.

I have also tried going back to Clickbank and getting another url, but the same thing still happens.

Has anyone else experienced this? Can someone please point me in the right direction?

Thanks

Thomas