i dont know whats wrong, but seems cleanflight can detect stick movements.
when i connect the receiver the channel one drops from 1500 to 1200 and keeps fluctuating,
rest of the channels stay at 1500 even if you move the sticks.
I have checked enable ppm in baseflight and in radio, i am using the jumper. Can't really make out whats wrong 

Which radio and receiver? Which flight controller? Are you running Cleanflight or Baseflight (you mentioned both in this post)? Does the channel order in CF/BF match the channel order of your radio?