Encoded Links

My links, such as
https://www.shareasale.com/r.cfm?b=778369&u=132296&m=32643…..

Were being encoded to
https://www.shareasale.com/r.cfm?b=778369&u=132296&m=32643…..

I fixed this by changing
$external_link = get_post_meta( $post_id, '_product_url', true );

to
$external_link = html_entity_decode(get_post_meta( $post_id, '_product_url', true ), ENT_QUOTES | ENT_HTML5);

around line 241 of the plugin. Hope this helps someone else.