Note: if you need general tech support for things like server configuration, Discord is a better venue. Please open an issue only if there is a clear bug with the pack or if you have been asked to by one of the Discord staff.

Pack Version:
1.6.1a (Curseforge)

Description:
I'm a clumsy idiot who often falls off his void base, but when I die of fall damage, I often respawn hundreds of blocks away from my base, infinitely falling. The only way to recover is to fall-walk all the way back and then disconnect-glitch to avoid dying again.

Expected Behavior:
I'm on a singleplayer world and have only one void base, so it should at least respawn me on solid ground.

Steps To Reproduce:

1. Set a waypoint at your base.
2. Die.
3. oh no I'm falling.
4. fall-walk all the way back.
5. Yep, it's still there.
6. Disconnect-glitch to avoid wasting another 10 minutes of your life.
7. Land safely back at base and regret being clumsy.

Crash Log:
N/A

Screenshots:

Based on the reported version, you appear to be experiencing issues with a different modpack, Nomi-CEu.

That aside, Nomifactory has a mod called Forgiving Void which wraps you to the vertical limit when you would otherwise fall out of the world and die. When this occurs, you are supposed to land and just barely not die from the fall damage taken.

If you die in the void dimension, I'm pretty sure you respawn at your bed. If you haven't set your spawn point, that might explain why you're appearing in such a random location.