Scrolling back I saw ...
Dokk heals you for 6775.
Dokk heals you for 3700 (ish)
Dokk performs a Critical Heal for 67785 (ish)
Dokk heals you for 3700 (ish)
Means you were down 3700 (ish) HP ... thus it only healed you for that amount. If you understand what I am saying...
Example
I have max 500,000 HP
I take 10,000 damage
I proc a heal for 37,000 - Non crit
Text will say ...
Paldail heals you for 10,000 -- as I am only missing 10,000 life
-- Only crit heals will say Exceptional heal (67,000) or whatever it is