Multiple 2-Step Google Auth. Codes?

[elgrayso 3]

I set up my Evernote for 2-step authentication and it seemed very familiar. I thought I had already done this but it said it was not set-up, so I did it.

Then I realized I had done this for Evernote in the past...

 

Now my Google Authenticator has two instances of Evernote in it, with different numbers. 

How did this happen?

 

I went to delete the first one but then it warned me that I could be locked out forever, so I got scared and left it there.

 

:-/