This is normal after you wear out your clutch and flywheel.
This is cause because YOU ride your clutch too much. Dont worry I do it too, to get a smooth ride.
You will notice if you let out the clutch faster it will not do it.
To fix this problem, you will have to change your clutch and/or flywheel. Either the clutch or flywheel could be warped....or it could be the pressure plate and the throwout bearing doing this.
Im doing a complete swap with UUC stage 2 clutch/flywheel, so I wont know what exactly causes the problem.
If it is just the clutch, you can fix it after a few clicks of hard clutch dropping.
Nothing major to worry about.....just wait till it gets worse and your clutch starts to slip, than upgrade everything. Just make sure you dont ride the clutch too much.