Good tips in the above posts.
What is the measurement on the die from the dog ear point out to the edge? 1/4 inch or less? Be sure you are placing enough fabric over the die blade edge. I miss sometimes and have short cuts on pieces.
It's a good idea to check the dies when you get them. They can be returned or exchanged if there is any issue. I have always sewn with 1/4 inch seam on all pieces. Fabrics are starched and pressed before using. Hope that helps!