After killing the ender dragon, me and another person went to explore the outside islands. After traveling for a bit and then dying, we decided to go back. However, now when we throw a pearl into the gateway or swim into the gateway it just takes us to the middle of the main island (near the exit portal) instead of to the outside islands. 

I am playing on Minecraft Windows 10 Edition version 1,14,6, and my friend is using the same version on the Nintendo Switch.