According the the Big Bang theory, the universe started as a 0-dimensional point of infinite density. Shortly thereafter, it underwent inflation and grew to some measurable size, and continues growing to the present day.
If, when inflation started, the universe was a "ball" of some measurable size, that implies that some of the matter-energy was close to the "outside" of the ball and some was close to the "center", even if there is no "outside" of the ball.
Why is it not possible to determine how far something is from that "edge"? If the answer is that the "edge" is farther away than light travels in 13.7 Gy, I can accept that. It is still some finite distance away, albeit too large to measure.
Am I completely off in my thinking? What is wrong with my logic?