Midi distortion after mix down

I mixed down a song that had two midi tracks. It sounds fine in Cubasis 2, but when I listen to the mix down, the midi tracks are warbly and distorted. The audio tracks sound fine. It’s just the midi. Any thoughts? I’ve never used midi tracks before.

Hi Sidvad,

Please let us have a step description, to allow our team to evaluate the issue.

Additionally, feel free to provide us with a short video that shows all involved steps and the problem.
In that case, please upload the clip via DropBox, WeTransfer or similar, and provide me with the download link via private message.

Thanks,
Lars