I new to quilting as some of you know. I brought one of those monthly Quilt Block Kit. And this is the problem. I cut each piece like I should I measured and remeasured. 2"x2" each finish row should be 2"x 6 1/2". And when finish the whole thing should be 6 1/2 x 6 1/2 Well mine is 6 x 6 I measured my seams to make sure they are 1/4 and they are. I just don't know where I went wrong. Any suggests? Nothing ever comes out the size it should with me.