Ipad pro display issue (stripes/line)

Today, for the first time, I found these obscure traces on the entire screen of the ipad pro 12.9. When you try to wipe them off, they become less visible, but when the screen gets dirty from your fingers again, they become very visible again. Is it just on mine or is there someone else with such a gap?

Sorry for the mistakes, English is not my native language.