Please I need help my email is acting weird!?

[Cart Farm]

So I have an instagram and I rarely get instagram emails for some reason. Anyways I had accidentally sign out of my instagram and I had forgot my password. I had asked instagram to send me my password or reset it. However I never got it until I search my email.i saw a message about my email was being switch however the emails look the same so I said okay . However after tries of trying to get my instagram password to reset I notice that the emails were different. One email had the same username as mine however it said @yahoo.co ? I tried signing as that and I was able to get in but I still can't find my instagram reset email? Is this two different emails ?
My email ospreygirl56@yahoo.com
The changed email is ospreygirl56@yahoo.co
Please help me