OB 1.1 individual track out problem

Hi,
Ive got an Elektron Keys- set it up according to elektron videos.
Plug in track+ 4 different individual tracks + 1 pre-FX track (like dataline’s video)
The synth sounds great through the plug in track and pre FX, but when I solo any of the individual tracks, the overbridge “misses notes” – which is to say, the latency if great, but if I play five notes quickly in a row, I’ll only hear 2 or three of them are triggered. When I unmute the plug in or pre tracks, I hear everything fine again. Thoughts?