How do I save a player's position and teleport them there later?

Hey! I've been working on a mod and quickly encountered a problem I could fix by myself. I'm making an item that allows you to teleport to saved coordinates; shift-click to record coords and right-click to teleport. For some reason, instead of teleporting you to the location you set, you are teleported underground at roughly 0 ,-1, 0. Here are the images:

Code:

https://photos.google.com/photo/AF1QipN3-H5rsw5Hl_PRDVsPBF8SiB793E2rmiYtlZh1

In-game:

https://photos.google.com/photo/AF1QipN_FpPTgrrCBME5jLaqAZQMpP6YrscJ2Skd1pEh

https://photos.google.com/photo/AF1QipOxd7E_vDHbnFmdYBf_VgZfLbVJc0bnqDXTgpiS

I really can't figure this out... Any help is appreciated!