How to lose a Rehab Buyer

[R Jenkins joshua]

Here what happen :

I been receiving emails from a different Acquisition Comp /person
with potential properties he had to sell

Well 1 of my buyers ask for properties under $16,500
,so I go check out this person inventory (seller )
and sign Optional contract to pick up a SFR

Optional contract indicated:
he can sell the property to someone else
until I sign a Purchase contract

Their Purchase contract was for 10% down
and closing within 5 days

I tried to wholesale it to my rehabber investor

He sends me email indicating the property on Econohomes
for around $8700 and that I'm selling someone
else foreclose property without permission / title

I questions the seller and received no response

FYI : I'm cancelling my optional contract asap

Next time :
I guess I will have to not only check the source (seller) ,
but to see who truly owns the property [MLS]

Due diligence all the time