Problem with the Plugin ''Lift''

Hello community,
I've got a problem with the plugin'' lift''.
We have thus created a 4x4 with a lift of 3x3 Glassfloor insider. Everything works just fine now only if you push the button then automatically created at these 3x3 glassfloors 2 extra glass-blocks in front and at the back.
Of course, now my question is how can I fix it.

Code:

# Config: Smaller values result in less lag. Lift speed less than 0.4 may not work well for non spout servers.
# autoPlace will automatically move players to be fully in the elevator
# checkGlass will make sure all floors have glass blocks (at the cost of possible lag when starting a lift)
# preventEntry will prevent players from entering an active elevator (at the cost of possible lag when lifts are running)
maxLiftArea: 16
lowScan: -1
highScan: 255
debug: false
autoPlace: false
preventEntry: false
preventLeave: true
checkGlass: false
floorBlock: GLASS
redstone: false
baseBlockSpeeds:
  IRON_BLOCK: 0.5
STRING_oneFloor: There is only one floor silly.
STRING_currentFloor: 'Current Floor:'
STRING_dest: 'Dest:'
STRING_cantEnter: Can't enter elevator in use
STRING_cantLeave: Can't leave elevator in use

http://dev.bukkit.org/bukkit-plugins/lift/

 

I am not sure I understand your problem. If you can get some screenshots or video of the problem that will help.