After transferring to another hosting the redirect does not work

[Mangoz]

After transferring to another hosting the redirect does not work

admin/index.php

Enter Login and Pass -> submit

url remains admin/index.php.
but must go /admin/admin_main.php

Although when I copy url /admin/admin_main.php and paste into browser, the panel is opened successfully.

Not triggered redirection . What could be the problem?

[Mangoz]

error found ) ) My new hosting does not understand a space before the <?php