Start and stops sends unwanted midi notes

Hey Guys,

I connected a Akai ME30P2 and a Akai ME30P to my UAD apollo X16 to record synths in Cubase 8.5.
Everything works wenn i record midi notes. But after i send the midi notes from cubase back to my synths there a strange things hapening.
Everytime i press start cubase seems to send unwanted midi notes. I hear strange notes i did not play and a note keeps simmering after i press stop.
I have to turn off my synth to stop the sound. :open_mouth:

Can anyone help me out?



Sysex data - shot in the dark.