Actually, yeah, Sprytes is a Tweedle name, I'm pretty sure. You either replaced the Tweedle portrait with the Dipster one in the files and are now pretending that it's a glitch for attention on the Internet, or the game somehow rendered a Dipster portrait instead of Tweedle's, which actually would be a glitch.
Yeah, I'm not saying that you for sure edited something in the files because it's equally as likely that the game just messed something up. But unfortunately, this wouldn't be the first time I've seen that happen :T