Why is Dark Souls showing double health bars on bosses?

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When I fight bosses I see 2 health bars (for each boss) along the bottom. One is yellow and uses most of the bottom of the screen, the other is red and is below the yellow one and in the left quarter of the screen. It is about 1/4 the size of the yellow bar.
I have DSFix installed. Is this an issue with that? Any ideas how to fix so that only one bar displays?
Screen shot from http://www.neogaf.com/forum/showthread.php?t=488240&page=119
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Does the soul of cinder have 2 health bars?
First things first: be aware that the boss has two full health bars, one for each phase.What boss has the most health in Dark Souls 3?
What is this? Interesting Fact: Despite Yhorm being one of the easiest bosses to beat, he has the largest amount of health out of any boss in Dark Souls 3.So I doubled every single enemy in Dark Souls... it's a nightmare.
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Images: Trinity Kubassek, Michael Steinberg, Lukas, ROMAN ODINTSOV