I found many people posting wrongly that it should be on the L mark to lose a bolt.

Totally wrong!!!!!

Trying it on a solid surface showed me that it should be on the R mark.

Meaning R is to loose right hand screws which are used in 99 percent of the cases. L is for left hand screw which are rarely used.

You also have to press the driver down with your and and only than hit it with the hammer otherwise the hit won't make the driver go down enough to rotate the bit.