I went through the end portal, but it randomly spawned me in the middle of nowhere and I automatically fell into the void and lost all my stuff, I had already used the portal once before, and it didn’t happen the first time, please fix this!

I went through the end portal and died automatically due to falling in the void, I have went through it once before and killed the ender dragon, so I don’t know what caused it to do this the second time, please fix this