ANSWER:

This is absolutely baseless and fabricated and goes against the teachings of Islam.

No soul would return on earth after death. 

What people might have seen would either be jinn or they’re hallucinating or lying.

You are protected from every evil, including Jinns, if you maintain your daily adhkar.

Sir people who die without natural death are said to become ghost and i have witnessed in my town ,few people committed suiside or kafir people are said to be wondering after death, do people really become ghost after death if died unnatural death according to islam?