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Just to rule it out… do you have MIDI cables connected? If so, try without them connected. Might be some unwanted MIDI Notes?
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Is the sequencer running when the sound happens?
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You are sure you’re not re-recording into the sliced buffer?
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Some FX anomaly? Switch both FX pages to None on that track.
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Does it still happen if you start a New Project and do the bare minimum to recreate it?