I don't know your pattern, so am only making an educated guess here! I agree with you, no it should not be looking like that.
My first thought would be .... go back and measure all your pieces. Are they cut correctly with precision? And measure all your seams, are they the exact 1/4"? A little out here and there for either, soon can add up to a major difference such as you have shown!!
On a positive note .... you have one awesome quilt in the making, as I love the colours/fabrics you have shown us so far. I am now excitedly waiting to see where it goes from here!