Can you post a picture of the blocks with the ruler on them? How are you squaring them? So you have a square with a diagonal seam between the two triangles? What is the finished size of the blocks?
You will square from the center diagonal line and work out. There may be UNequal amounts of fabric to trim.
Hope that helps. It's hard to help and follow without pictures and more information. Other quilters may have better suggestions to help you.