Rock Shox Recon does not "completely" lock I recently bought the 29er CUBE ACID 2017 equipped with a RockShox Rrecon front fork (Silver TK AIR PopLock 100mm).

I have noticed that even when the suspension is locked, there is still a movement (compression) of the stanchions of about 20mm. It is not completely rigid, not locked, even though the knob and the crown of the fork is in the LOCK position.

Is it supposed to work like this (as the shop I bought the bike from tells me) or is it somehow faulty? I am new with bicycles and I would appreciate your help!
RockShox FAQ FRONT SUSPENSION Remotes/Lock Outs:


  Why Isn’t The Lockout Function Completely Locked, Instead, There’s A 
  Bit Of Travel?
  Please know the lockout setting on most RockShox forks is not a “hard 
  lockout”- meaning you will have about an inch of movement when the
  fork is the locked mode. We call this feature Small Bump Compliance, 
  and the intention is that the wheel will continue to track over 
  ground with control, even in the locked setting.