Plesk Login Issues

[JohnR]

Issue with Pop up login on plesk
When Some of our Devs try to log into plesk they are getting a popup box asking for a username and password.
This box does not accept their personal username or password.

It will accept psaadm and password.

This then takes them to the plesk login which allows them to login.

How can we stop this happening as we do not want our devs to have the psaadm password.

We are using Plesk 8.2.0 on a windows server.

Thanks