My Text Updates Are Going To A New User Account, Not Mine - How Do I Fix?

I set up my phone for text message updates, and whatever I text hasn't been posting on Twitter... but today I searched for myself on TwitDir, and MyUserName1 (so MyUserName with a "1" appended to it) is getting my text updates! So a whole other user account is getting my tweets from my texts - how do I reroute that text traffic back to my actual (full) account?
 
sad I’m frustrated
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