btools doesnt work, neither do exploits kill players

My problem is that whenever I try to kill a player with the exploit, it shows that they have died on my screen but it didn't actually kill them on anyone else's screen, therefore the person is still alive. The same thing happens for btools, if I delete something it only shows on my screen and not anyone else's, neither are people able to go through the deleted bricks either.

Example:

• I use the exploit
• Kill person with exploit
• Person shown to be "dead" on my screen, but still types normally and doesn't react as if nothing had happened and doesn't respawn either, leaving just a corpse on my screen and no one else's.
• Therefore, person wasn't actually killed for reasons I don't know.

This same problem is happening to my friends as well. Any solutions or fixes for this, or if the devs are able to fix this?