I am new to using the Xtool M1 Ultra, and I have some questions about wood materials for cutting. I tried the Xtool samples, and they worked great, but now I've gone to the local store and bought cheap 4mm pine wood. The issue is that when I cut it, the burned area stains a lot and looks quite bad, especially if it's an item for sale.

My question is: Does the laser always leave the wood like this and stain, or is it just the quality and type of wood? Thank you!