Why am I getting double music in karaoke app or any other recording app?

I am using Resurrection Remix ROM on Redmi Note 3.

Whenever I try to hear my recording in the "Sing!" app by Smule, I hear double music. I have tried 2 more earphones after my primary ones. But problem is still there.

Also, to test, when I tried it on my laptop, while recording, I tried to change the volume(to get that Windows system sound), and even that system sound was recorded! Is it the earphones I own? or is it some software problem?
Primary- boAt Bassheads 220
Others- Samsung stock, Sony MDRZX130AP

Thanks

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