Double registration

I bought a part (16 cents out of 142 cents) of another person's (Mr.X) land in 2009 and in 2014 Mr. X sold transferred his property (142 cents) to his son (Mr. Y) including 16 cents which was sold to me in 2009. And it got registered also. Now both are reflecting in encumbrance certificate. Now anyway Mr. Y wanted to sell his property to some other party. However, he realized that 16 cents was not his and he only sold 126 cents to the third party excluding 16 cents. Now, should I worry about anything? I am still the owner of that 16 cents? If I want to sell my 16 cents in future, would I have any issue doing the same because in latest EC I was not the owner? My main doubt is, can i still rectify that deed (Registration from Mr. X to Mr. Y) i have this doubt because, Mr. Y has already sold his land to another party but he has sold only 126 cents (Excluding 16 cents)