I was in creative mode building something in the end dimension, when I flew over to one of the pillars I noticed that there were what I thought were two end crystals occupying the same space. Upon further examination, I noticed that there were in actuality three end crystals where there should have been one.

Steps to recreate the issue:

1. Create a world with the following seed: 1334864870
2. Enter the End Dimension
3. Fly to the coordinates in the screenshot, a text version of the coordinates is provided for those who do not have a fast internet connection: -39, 104, 0
4. There you will see the three aforementioned end crystals.