Seems to work here. Maybe check the card in question in HTML - there might be a span or something in or around the link that's causing a problem.
Note that you don't need brackets around URLs at all to have Wagn turn them into a link.
Yeah, I actually wanted to create link text, but that wasn't working so then I tried just the link to eliminate a variable and THAT wasn't working. But you're right, I didn't check the HTML. There was a close span tag at the beginning of the link for god knows what reason. Thanks!