"Why would proconnect populate a schedule F on a corporate return "

Who knows? Some software does. As you noted, it is a 1040 Schedule. I've never tried to do one on a 1120 or 1120S.

@TiredFarmer  Can you weigh in?

"should I amend?" Amend what? To go to or from a Sch F? The net income wouldn't change, would it?