If you decide to remove the border, measure the space each of the triangles SHOULD take up (if they were not stretched out of shape), mark the space and fit the triangles' bias edges into the corrected space (divide triangle edges & pin), and re-sew with the triangles on the bottom. I have done this and it worked well for me, but I did it the first time I put the border on ... in other words, I never had to remove it and re-sew it.
Is this clear as mud?