MIDI keyboard notes to A4 via OT

My current setup:

MIDI Keyboard -> MIDI -> OT -> MIDI -> A4

I’m using a MIDI track on the OT to route MIDI notes from the keyboard to the A4.

When I record a sequence on the OT midi track, works fine and the A4 plays it

If I record on the A4 sequencer instead, some notes are fine, others are half-lit trig and don’t play

Have you guys any idea? It doesn’t look like a normal behaviour