I've been using the !so @member format with this command for almost 2 years, both as a streamer and a moderator. Normally the return from nightbot omits the ampersand (@) so the URL is accurate... but recently, it's returning it with the ampersand. so instead of https://twitch.tv/username it's posting https://twitch.tv/@username which is inaccurate.
Any insight onto why this is? the command text looks just like it should... If you haven't yet, please go show all the loves and support for a wonderful streamer https://www.twitch.tv/$(1)