why is my new gamer tag below my old one?

For some reason my new gamer tag linked itself to my old gamer tag email address. I don't know how to change that and to link my old gamer tag back to my Microsoft account. I believe that's why I cant play as my old game tag. Is there a way to fix that?

My old gamer tag has my wife's email address and my new one has my address. I want to delete the new tag completely so I can put my email address on to my gamer tag if that makes sense?

Gamer score leaderboard also shows as my old gamer tag above my game points, are these places where my new gamer tag should be on Xbox 1? On my Xbox 360 my old gamer tag is nowhere to be found even if I look for it

I sign in with email and old pass and it leads me to the new unwanted gamer tag. I try and sign in with my email and new password for my old gamer tag and it doesn't accept it.

Thanks, I appreciate you getting back to me but that isn’t helping.

Maybe I’m not explaining this right.

I restarted my console this morning when I signed back in I didn’t read things correctly and used my email and password to sign in and then started with a new gamer tag with the same email as my old gamer tag.

Now when I sign in it’s my new gamer tag that pops up. I tried deleting the new tag off my console and resigning in but again the new gamer tag pops up.

There is no option to look for tags associated with the same email???

All my purchased games and game pass is associated with my old gamer tag. How do I get my old gamer tag back with this email and onto my console???