Why do so many people play this riff wrong?

In this video I am showing why many people play this riff wrong.
Thanks to the peeps of the YouTube clips I was showing, it's not meant to bash, but to learn other viewers why this happens to so many guitar players! And of course to teach you how to avoid this stuff from happening :)
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***GEAR***

GUITARS:
Les Paul Custom Shop Reissue '59

AMP:
Kemper Amp - http://amzn.to/2zWRdZi

MICS:
RØDE NTG4 (for vox) - http://amzn.to/2x51Vwa

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Видео Why do so many people play this riff wrong? канала Paul Davids