Without doing anything specific I have suddenly the location path of the desktop image written on my desktop like

(3)/System/Library/CoreServices/DefaultDesktop.jpg

On my 2nd Monitor it says (6)/System/Library and so forth.

Its not clickable, changing the desktop image is changing the written path, but not the mentioning itself.

Any ideas? My System MBP 13" Mid 2018, (4 TB3 Ports and TouchBar) 2,7 GHz IC i7 16 B 2133 MHz LPDDR3 Intel Iris Plus Graphics 655 1536 MB macOS High Sierra, 10.13.6 w/ security update 2020-003