iTunes account is showing a different name and incorrect password

iTunes store issue. I went to the iTunes store to look for some music I intended to buy. I noticed on the screen it said 'welcome back Enhypen'. That isn't my name. When the purchase screen asked for my sign in and PW, it tells me my PW is wrong. I've verified my PW is correct for what I use it for, including iTunes. I tried signing out and back in with the same results.

Any ideas what's going on? And, who the heck is Enhypen?

Thanks Bob.

[Re-Titled by Moderator]

Original Title: iTunes Mystery