I think the trick is to say the income was made without an intent to make money. Then it just gets added as "other income" instead of creating a self-employed section. Honestly, it might just be fine since it's apparently being filled in the right place doing that (even there was clearly an intent to make an income from the investment).
TurboTax should just fix it and add an option saying it was just some unusual investments (e.g.: structured investments).
