First message ever

A little help please. I am on Mac and used to transferring sysex to several synths via SysexLibrairian.
I have already successfully transferred sysex to my DW8000. (IN and OUT).
However for the past 3 days he has received the notes or the program changes via my motu midi card but not the sysex.
This is not a midi channel or cable or interface problem as the other midi data is received correctly.
It’s only sysex that is not received as if the synth was protected (like sysex disable… ???)
Do you have an idea please? I'm totally stuck.
