Your instrument has an internal DSP effect chain.
When a DSP chain is used within the instrument, the samples can no longer be freely played on any given track as they usually can, they are instead being routed through the internal DSP chain and mixed down to a single stereo audio output.
This single stereo output cannot be played on multiple different tracks simultaneously, it can only play through a single track at any given time, much like a VST synth with a single stereo output.
When you have the notes placed on multiple different tracks anyway, Renoise will simply try to "steal" the audio and force it through whichever track played the most recent note, which often doesn't work so well.
But there's not much else we can do in this case. You either have to play all your notes on a single track, or you have to set up some more advanced routings within the instrument, to send each of your desired sounds through their own dedicated DSP chains where they can be processed individually, and then route those chains out to dedicated tracks.