Does this sound too good to be true?

[Carlos Asuaje]

So i am new to this RE thing but i feel like this deal seems a little fishy, it just seems too good to be true. I found a deal in charlotte, NC for a MF duplex rental property for 129k asking price, for sale by owner. The seller says that he has tenants in place currently and he cashflows 1300 a month from the property....my question is why would you want to sell a property like that? He said he rehabbed the entire property, so my guess is maybe he bought for very cheap and now wants to make a significant profit on a flip, but i dont know, it just seems too good to be true to me?