Closing on a property on Monday... but it's under contract twice?

[Thomas Moran]

Hey BP-

Title kind of explains it already, but I am working with a wholesaler to close on a property and he is urging me to close quickly because the seller went under contract with another wholesaler. I am familiar with the other party and they are not super ethical because I have worked with them before. The first contract has an affidavit recorded at the courthouse, but will this present any problems to me? 

How is this even possible/why would a seller knowingly go under contract twice at the same time. I searched the forums and couldn't find any similar experiences.

Thanks in advance.

-Tom