Wp signature plugin not pointing at external link

Hi all,

ive installed wp signature plugin and id like my links to point to my website from my blog ie: i have put my signature as:
<p><strong>Posted by <a href="https://www.website1.com">keyword keyword</a> your guide to <a href="https://www.website1.com/en/xyz.html">keyword keyword</a> Barcelona</strong></p>

[Please post code or markup snippets between backticks or use the code button.]

but it defaults to prefixing my links with my blog domain so i it goes to:
https://www.blog.com/https://www.website1.com etc etc

Im not sure why and im not sure how to change it. Any ideas? otherwise this plugin is useless