I'm playing heavily modded Minecraft (it was until yesterday, 320 loaded mods) and whenever I die and respawn, after a few seconds I get "launched" thousands of blocks away. Tried leaving and rejoining world, restarting game, uninstalling and reinstalling (saving world), nothing helped. I can send a mod list or a video of what happens if someone that wants to help needs it.
I'll see what I can do but not sure if can solve it.
1.Mod list will be helpful. Whether it's a mob, a teleportation/random respawn type of mod by the sounds of it or something else.
2.Video footage would be helpful
3.Do you have a log you can view also as that might also make it clear what's going on.
You could test with a copy of the world and move mods in and out to see what's causing it (even though 320 even if not 100% 320 as it's usually library and other mods that make it that high of a number unless you do actually have a lot of mods in there).