Hi Jason, thanks for getting in touch! I’m guessing that you’ve created a new Additional Field there for the website URL (set up via Events > Settings > Additional Fields)?
Events Calendar PRO doesn’t actually know that this is a URL – it only knows that this is some additional text you have provided, so I wouldn’t really agree that this is a bug.
Give me a moment and I’ll see if I can think up a snippet of code to help you out here.
You could try adding this snippet in your theme’s functions.php file: http://pastebin.com/Z60AYYkM … I did a quick test and it seems to do the job, it does assume that the URLs all begin http:// or https:// though.