is the schedule cast certificate valid and of any problem in future

Sir with due respect. My grand father is a bengali settler came to India from Bangladesh in 1960 Under D. N. K project. At the time government of India provide migration family card where his cast mentioned as khtriya which is a general cast in odisha but government of odisha provide settlement land patta in 1979 where his cast mentioned as Namasudra which is a schedule cast in odisha. Hence my real cast is khtriya. But l got a schedule cast certificate showing my grand father land patta. But migration family card also a important document to issue cast certificate in odisha for bengali settler.. recently got a government job. When I applying for the job I produce schedule cast certificate but I selected under unreserved category. Is it any problem for me in future...if any one complain about the cast certificate. Please help me sir...