Since you say "i don't even need to transmit or receive midi on my H9", I'm not sure why you have the USB connected to the H9. Assuming you need to, you coulkd try setting it to THRU (this does not operate on USB, and should stop it from sending anything).
But, I am obliged to say that I think this is an issue with Logic. USB is a master/slave system, so anything the H9 were to send would not go to any other USB device unless the computer sent it. The H9 does not send MIDI note, in any case.
It is possible that the H9 is sending a CC or PC that is confusing Logic and causing it to send your Note on message – this can be stopped by turning these off on the H9 (see UM).
