Registration with RVP in Russia

Here is my situation, I have RVP and permanent registration in the city where I live and work.
I want to know) if I must have a registration each time I change the address ( apartment or room) I rent.e
I received a fine to pay just because I live in another address different from the permanent one.
Some people say there is no need to register given that I have a registration in the same city
Others say I must register whenever I change a place of stay.

Please share your experience
Nb: My permanent registration is valid for 3 years

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