My YouTube name showed up in an email

I have two email accounts, one through school and one personal email I made before I went to school. For a college I applied to, I put my personal email on my application. That email is also the one I used to upload a YouTube video once. My dad didn’t like that I used my real name as my YouTube profile, so I changed the name for that account. I basically changed a few letters, but it is not my real name (think changing Leah Jones to Aleah Jonas or something). Anyway, I sent some essays for a scholarship to that college through that email account. My real name is in my email address, and on my essay submission. Well today, they sent an email back saying “Thank you for entering, etc.” except they addressed it to my YouTube name! I guess I didn’t realize that that name would ever show up after sending an email, but that is my own fault. I changed my YouTube name back to my real name and just put my account on private. Do you think colleges will notice this and think me unprofessional/joking? Do you think it was an automated message and they will even notice? Thanks for any advice!!