7-fold is on it, but is only 6-fold

I have looked for a very simple lever for my bike and found a thought. Unfortunately, the lever is a little too easy.
Even after the 5th attempt everything set so that all programs can be switched, I unfortunately did not succeed. Even my brother, who dismantled their bikes for years and built up again, has failed. Either go only the gears 1-6 or 2-7. When the lever is not connected but you can go through all 7 positions.
Visually, the lever nothing ago (it's the one with the silver and black label on the 3rd image), is completely loving plastic and stickers with the numbers on it peels off and slowly but surely.

The lever will be soon replaced by a higher quality of Shimano.