PhpMyAdmin SSL Problem

Hi,
i'm managing a server where one of the sites runs a SSL Certificate.
I previously secured my PhpMyAdmin configuration with SSL Certificate and all went well, after adding the SSL Site i get a strange issue.

When i write

https://my.server.ip/phpmyadmin_url

i get htpasswd prompt correctly, then i write credential.
After htpasswd login ok, i get redirected on

https://siteurl_with_ssl/phpmyadmin_url

and does not work.
It's really strange, i also secured my squirrelmail installation, when i write

https://my.server.ip/squirrelmail_url

i don't get redirected as PhpMyadmin does.

What could the problem be?

EDIT:
The squirrelmail certificate is the one that the site has(strange!). It should be a self-signed certificate that i've created for the default-ssl host.

If I write http://my.server.ip i get redirected on the default page(it works!).
If i write https://my.server.ip i get redirected on http://siteurl_with_ssl/ (without https)