Have you tried restarting the game application? Occasionally, if you've left an emote on for a while, it can get a bit "stuck" on your character, although closing it and reopening the game usually fixes this. Are you pressing anything or messing with emotes that would cause the emote to get stuck? You may want to go into your in-game setting and make sure that a certain key isn't activating the emote. Be sure that you haven't selected the emote as a permanent emote for your character in the character creation selection, as well, although since you aren't experiencing the emote sticking right away, this may not be the case.
If all else fails, you could always try re-installing the game, in case you may have moved around any files.