Is it legal to buy a DC converted site which belongs to SC/ST ancestral property developed on GPA

Dear Sir/Madam, I have bought a residential site 3 years back near Nelamangala, Bangalore Rural district of Karnataka. It is developed on a property belongs to SC/ST which ancestral property for the original owner. We have documents from 2000-2001 that shows this is a ancestral property. This property developed by a Developer based on GPA given to him from the original owner of the property. GPA holder (Developer) sold the sites to us in 2016. Here are my questions regarding my site which I bought. 1. Do you see any issues buying a developed site developed on SC/ST ancestral property? 2. Sale deed is signed by GPA holder and not the actual owner, Do you see any issues here? 3. On the registered GPA, they have shown the amount settled(as part of sale) for actual owners of the property. Is this legal? 4. Revenue records still show original owner with revenue authority even after DC conversation of whole land. Any issue here? 5. Do you suggest me anything which i need to take care before I get into legal issues? Regards, Kumar