Why I cannot save passwords in web browsers?

I am using Galaxy Nexus and as it is not supported anymore, so I use Cyanogenmod for software updates. Up to now I have used CM11, now I use CM12.

I have noticed some long time ago (probably with CM11), that web browsers do not seem to store any website passwords despite their settings to "store passwords" and/or "remember form data" being set to "on".

I did some testing today and I have noticed that: Default browser supplied with CM, Habit Browser, or Lightning Browser do not seem to remember and retrieve password. However, Chrome and Dolphin works fine. But in Dolphin only when their rendering engine (Jetpack) is enabled.

Is that some update in underlying Android library or rendering engine which some browsers do not keep up with or is there something else I am missing?