Hey !
It seems that in some cases , the Randomness and Probability were both defaulted to 50 in the factory. Thus unwanted trigs and random notes !
To change this, clear any running sequence, and set both Random & Probability to 0 using their knobs, then make sure to save this on every projects (hold the Project & Save button, and click on the first step to save it on Project 1, as well as all the other steps, so that this is saved on every projects)