Option in color tab to change color of heal absorbs.
it's hard to see it if you are using black hp bar with grey background or even with default options when it's slightly darker then class colored health bar.

Seems like the Absorb coming from Evoker healer it appears beside the healthbar not taking the remaining width on the same healthbar, its pretty annoy if you can check it, I relog on priest and it works normally but after a couple of test there's nothing you can do to display the absorb normally just like the picture in your gallery in wago.io