Every laptop I’ve owned has done this, the marks wipe off. It’s never caused any damage.
Also, this is a duplicate thread. Here are some other threads where this is discussed:
https://community.frame.work/t/psa-keyboard-marks-on-the-screen-are-removable-with-water/
https://community.frame.work/t/keyboard-leaves-marks-on-screen-when-lid-closed/