My eBay user name has been changed without my knowledge?

[nkee6135]

I recently ordered an item and the seller is telling me that they initially could not find my username. They have now found it but it is not my unique username.

My original email is oprerational but there is a 2nd one coming up?????

[11dustyattic]

Be careful. Could be a acam.

Is your user name displayed the same to you. Sorry I'm a little confused. 

[11dustyattic]

oops scam I meant