Mend Flesh not working

Hi together,

I’m a big friend of the raven and I used to use Mend Flesh for a long time. But then I went for the Lightning Strike … today I wanted to use Mend Flesh again cause I loose too much health in Ancient Grove, but even if the raven is set to Defensive Stance, he does not heal me - never. What do I wrong or is Mend Flesh somewhat broken? :cry:

I have 12/16 points on Summon Familiar, 18/16 on Mend Flesh, 12/12 on Storm Spirit, and my char is a LVL70 Pyromancer.

Thanks in advance!