We’ve just deployed a hotfix to Just Survive server that should fix the following issues:

  • Players getting launched into the air when jumping next to some terrain (This is a speculative fix. Please report in the comments if you are still encountering this issue after you patch your client)
  • Players getting instantly killed when jumping against certain objects
  • Players will stop moving when they open their inventory

You will need to restart Steam to get the client update.

Source: Reddit