After duplciate website to work with, there is a conflict

Hi,
I have working on one website on my server, then i make a copy of it, and work on copy, but it have conflict, when i try to log in on one wp-admin it appears wp-admin of other site instead like in this example:
1.I type the 1st site wp-admin in browser and adress is good, but it shows the 2nd site even when link is good.