1099 - NEC

I've entered my information both with the 1099NEC form or as W-2 (at some point, there is a question asking if the income should be entered as W-2)

 

I notice my refund calculated is much larger when switching to W-2 (more than double)

 

I am wondering if I am making some error in inputting it as 1099 income, and want to confirm that 1099 NEC should in fact be entered as Self-Employment income? 

 

Assuming so, is there a reason that if entered as W-2 income, the estimated return is over $3000 more than I entered under Self-Employment? Should entering income as the latter disqualify one from receiving the EITC?

 

Additionally, when it begins asking me about whether I actually should have received a W-2, I am unclear about the information they use to determine which it should actually be. Can this be clarified?

 

It seems that if there is a gray area or people are being paid / treated as private contractors when they may more so be considered employees, then arguing this point may not be in a payee's best interest

 

Thank you for any insight