It was due to bad dumps. I had bin files and a .zip romset solved the problem.
The control issue came from the 8bitdo controller. I connected it like a switch pro controller and everything is fine again.
I went further and replaced some of the original roms with dreamcast ports in order to use Redream. Really good perfs now !
Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first