Hey @gm13, welcome to the community, Alex here!
Really sorry to hear about that, your username definitely shouldn't change.
If you're not able to log in with your original username, you can try to use the "Forgot username?" button and that will allow you to regain access to your account.
Should there be any issue with your password, you can do the same thing with the "forgot password?" button.
Also feel free to get in touch with our customer service through any of the channels here if you need more help and we'll be happy to assist.
