I probably wouldn't worry about it unless it was in an area where you would see it a lot of the time. I had that problem one time and now I always use the same color top & bottom. Seriously, you could always take a pin, tweezers, or whatever and lightly pull those threads up to see if you can bring the seam more into balance. If the seam goes off the edge, you could undo that part of the binding and pull the blue thread to tighten it up and cut the extra off. You may have to hold it on both sides of what you are pulling. If you pull too hard, you might break the thread, so be gentle.