Random Teleportation Upon Re-log

I was going down to my Endermen farm. As I was going down the Waterfall. (As seen in the Picture.) I noticed that the ticks just stopped. I noticed this because I could not eat food, Eating noises and particles kept going on no matter how long I right clicked. I decided to re-log to fix this. But when I re-logged I noticed that I was in the ground 1,000 blocks away from the Main End Island in the center of the end. It teleported me 1,000 blocks in the Z axis when I quit the game, and restarted the game.

Picture of Island: