Teleporting up works properly, I assume, and the teleporter block aiming down has less of a range.

Ex of Up range being proportional. http://i.imgur.com/nH7oGol.jpg
EX Of Down range not working. http://i.imgur.com/FNcBBmJ.jpg

If I am doing something incorrectly, I would love input.

If this is at the absolute range limit this could be due to you being one block closer to target when on the lower anchor and one further away when you are on the upper anchor. Assuming the range is calculated from your person to the target anchor as opposed to between the anchor you're on to the target anchor.

That's exactly what's happening. I don't personally think it's an issue, as physically you ARE closer to the upper teleporter when standing on the bottom one than vice versa.