I had similiar problem yesterday with my centre.
Look carefully at the centre in my case the seams and points did not match up. After so every crafty re positioning and sewing seams at base here is the result. How did mine happen . I forgot I was moving needle one notch to the right to make a scant 1/4" .
Will hopefully be quilting today.
First picture , the finished alterations
Second ". , before I started looks just like yours. I did alter before putting squares and triangles on.