Why can't I receive incoming calls on Lenovo K6 Note?

I have purchased Lenovo K6 note last month and now I am facing issue with receiving calls! It gets hang when I try to receive the call by touching green part. Please let me know how to deal with this?

You need to drag the  white call item on top of the green one to answer the call instead of tapping on the green item

Hi Palak. Are you using any 3rd party home launcher or dialer app?

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