Question

why were the FCI granaries overflowing with food grains and how the situation was controlled?

Answer 1

FCI Granaries were overflowing with grains due to inefficiency of the PDS to deliver food grains to the people. That is why, there was prevalent hunger and overflowing granaries at the same time.
The situation was controlled when the government launched a series of schemes to provide food to the poor from these granaries.

Answer 2

Due to a good monsoon season,grains produced were in huge quantities.
Government controlled situation by selling the grains in open market.