Why is OT adding a NOT2 when placing trig?

I am in MIDI mode on the OT and sequencing a midi instrument, OT is in REC so I can place steps. Whenever I place a step/trig and keep it pressed, I see it automatically has two midi notes (a C3 and a C#3 on NOT2)
Why is this?
It is annoying when I only need one note on a step, that I have to get rid of that extra note everytime.
There must be something I overlooked…?

New project. Try it again.
Default setting is root note.

Weird behavior if I understand well.
Default setting is root note and when you press a trig you have root note and note 2 ?
If you have other incoming midi messages, “weird” things can happen.