grammar dikduk - Why do we vary the form of the attributes of HaShem in the selicho "Kail Rachum shmecho"?

In the selicho "Kail Rachum shmecho" we ask HaShem to do things because of ("lema'an") - a list of things. Some are in the masculine form eg shemecho and some in the feminine form eg amitoch, brisoch. Why?