If its new, probably you are not putting consistent pressure, I have found this is often the problem with me. Just go slow, and always double check that all fingers are out the way. I am very careful to always lock my blade and be weary of where my hand is that is holding the ruler, and tap on wood have yet to cut myself in ten years. Also, the ergonomics of your table might be making it awkward for you to apply pressure, might be too high or too low