I can't duplicate your problem on my computer.
I'm using the desktop Home & Business version of TT. Each and every time I enter a mock 1099-NEC in the "Income from Form 1099-NEC" section under Other Common Income, the program generates a Schedule C and a Schedule SE.
All I can suggest is deleting the entries you've made and starting the 1099-NEC section over. Be sure to complete each page carefully and continue all the way through the section. This is unlikely to be a program bug, because thousands of TT users enter 1099-NEC's and if there were a bug in generating Schedule C's, this forum would have been flooded with similar questions - which it was not.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
