Drone or not?

What is that? In Hesse/Germany there is for few months this drone. It seems it’s a Drone from Israel, but when I use the flightradar from the German Flight Control, there is nothing to see.

https://stanlytrack3.dfs.de/st3/STANLY_Track3.html

I wrote one month ago the German flight control but they didn't give me a concrete answer.

What do you think it is? An artifact or something else?