I have a Nissin Di622 Mark II which I was using nicely with a D40 and a D7100. I don't remember getting overexposed photos.
Now I use a Z 50 and I often get overexposed shots, no matter whether I use direct or indirect (pointing up plus white diffuser card) flash, sometimes even if I manually decrease flash power via buttons on the flash unit itself.
Is there a setting I am supposed to change, or is the flash not compatible with mirrorless? How to solve it?