Maharashtra Traffic Police — Police manual signal violation meaning and the reason of imposing the fine

Today my bike (MH03BR 2850) was parked at mulund. The vehicle was parked as such there was no interruption with the ongoing traffic and neither there was no NO PARKING ZONE. The other bikes and cars with the traffic police vehicle were also parked over there. I got a message of imposing the fine of Rs. 500 with the description of POLICE MANUAL SIGNAL VIOLATION (challan no. MUMCM[protected])
I am ready to pay the fine if found guilty but I want to know the valid reason.

As there is parking aloted by MCGM but it's closed from many years then where should we park the bikes and cars.

I want to know the valid reason.

And also saw many times that the police incharge hide and takes the photos.

Misusing the authorities.
Poor middle class peoples are getting targeted for this..

We want the justice..

my vehicle number DD01M9362 is on way . no any vilolation activity . my vehicle is 40-60 speed and direct police officer manual signal but i have no show in officer because my vehicle behind the bus . so i request remove this challan no. PNRCM[protected]