Question about Rommelsbacher EKM 500

hello, this picture has probably crept in by mistake. In any case, I have never discovered anything like this on my grinder. However, the value for money of this grinder is very good. I use it in our company as a grinder for decaffeinated coffee beans. It has already completed thousands of grinding cycles and is reliable. However, it is a bit tricky until you find the perfect setting. If you want to change the brand of coffee frequently, it is not so suitable. However, if you use the same beans for a long time, you have a perfect grinder despite the low price.