That’s actually extremely common…the stickers get stuck on an edge (which gives you more area to engrave on without having to remove them so they don’t interfere with engraving depth) and the fisheye effect of the camera makes it harder to read them there.
If you click on the Unknown Material button over the left thumbnail column, you can search for any Proofgrade material, select it by clicking on it, and automatically load the settings for it. (That’s the easiest way to deal with it.)
Or you can flip the material so that the sticker appears in the upper left corner…the machine can read it upside down.
Make sure you have run the Lid Camera Calibration process as well. It tends to clean up that view a lot.