I think i might have put in something wrong because before i put in a 1099R i was getting a return of about 500 dollars and after i put in my 1099R i was getting 2000?

I think i might have put in something wrong because before i put in a 1099R i was getting a return of about 500 dollars and after i put in my 1099R i was getting 2000? is a 401k withdraw suppose to give me that kind of return ?