This issue was first brought up in the elementalist forums at https://forum-en.gw2archive.eu/forum/professions/elementalist/Question-on-Soothing-Mist-and-Soothing-Power/first#post5968561 .
The Water traitline gives a buff called Soothing Mist. Soothing mist currently does not work properly. The GM trait called Soothing Power, which doubles the healing of Soothing Mist, works properly.
The first screenshot is of Soothing Mist without the Soothing Power trait active (190 heal/sec).
The second is of Soothing Mist with the Soothing Power trait active (382 heal/sec).
The third is the tooltip of the Soothing Mist trait with 984 healing power – 3,568 heal/10 sec.
The heal ticks once per second. 190×10=1900/10sec without Soothing Power, and 382×10=3820/10sec with Soothing Power.
In summary, Soothing Mist heals about half of what the tooltip says it does. With the trait to double its healing, it heals just over what the tooltip says it does.
Tooltip says I should get – 356 heal/sec without the Soothing Power trait, and around 712/sec with the trait.
See the linked thread for someone who lists the formula for the healing.
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