Thank you all for your suggestions. I do load the fabric length of grain into machine. My fabric has a half an inch extra over die cut lines. I have looked at all of your suggestions and checked. The only thing left I thing is the die itself. I had a 5" square die that I discovered was off by 1/8" inch. It measured 5 x 4 7/8" as opposed to 5 x 5. This is a double stack half square die.
It measures 4 1/2" wide by 10 3/8" long, including the seam allowances.
I have not tried the paper trick. I will cut another set of triangles later today and use the paper to see if it helps. Will let you know if it does.