Your English is very good. The only issue is that you did not provide enough information.
It sounds like one of your rail guides is out of alignment. Unless they changed the rail guide system, the old procedure for adjusting the rail was to loosen two screws that are on the side where you see the scrape marks. The guide rails guide the push plate (tray) that pushes the bisquettes.
Remove the generator cover. You will see the push plate (tray), and two rails, one on each side of the push plate (tray). Each rail has two screws holding it into place. Loosen the two screws (do not remove them) on the side you see the scrape marks, until that guiderail can move. If there is a build up of residue you may need to clean that area, so the guide rail can move freely. After the guide rail is loose, push the wood advance button a few times this will let the push plate realign the guide rail. Carefully tighten the screws, without moving the rail. Push the wood advance button to make sure the alignment is correct.
If this does not work check to make sure the guide rails are not bent.