I have this same issue. I am married filing jointly. Both my wife and I received a 1099-NEC from the same company for different jobs we do for them. I am unable to add a separate 1099-NEC under each business schedule C for both of us. When I go into my wife's business income section and try to add her NEC income, it removes the income from my business. I have gone through and deleted the NEC's but it happens over and over again. The only way I have been able to get both NEC's put in is to add them both to one of the business income sections, which of course is not technically correct. It does change the amount of tax owed/refunded if you put them both in one business over the other. I added a second NEC after putting the first one in within the same business. There is no other way that I can see to do it. I think there is a bug in the Turbo Tax software as the previous user stated.
