Since the early 20th century, controversies have arisen regarding the accuracy of the monument's placement. After the initial surveys, it was found that the borders did not always follow the lines of meridian and parallel (as they had been intended to) due to the primitive surveying technology available at the time. This discrepancy left the four states asking if the correct borders were the exact lines of meridian and parallel (and if new, more accurate, surveys needed to be done), or if the markers placed during the initial surveys were now the actual border.