Accessibility services not visible on Android 4.2 Jelly Bean

I am using a Karbonn A12+. It is a Mediatek device (MT6572 chipset) and works on almost stock Android 4.2

I have installed Talkback, Floating Notifications and a few other apps that require accessibility service but none of them appear in the accessibility settings option. Doing the exact same thing on my Android 4.1 based tablet and Android 2.2 phone creates an option to enable accessibility service for apps requiring that. Any idea to get things back to normal?

I am not visually impaired or anything, just want to use those apps which require this. I really want to use Floating Notifications along with XHalo Floating Windows to get Halo like multitasking on the stock rom. The snapshot below is all I get in the accessibility settings screen. I have tried Factory resetting the device and wiping cache/dalvik cache, fixing permissions, things not even distantly related to the problem but to no avail.

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