textfield tag with password="yes" - not hiding letters

I have a screen that has a password field (textfield tag with password="yes"). When I fill the password field with the password from a datasource, it shows it as text, not the password circles for each letter. If I clear the field after it was filled from the datasource and retype some letters, the letters stay visible.

If I don't prefill the password field from the datasource and just type in it, it works just fine.

Thoughts?