challenge quest crashed my gunz launcher and i notice some of the npcs was stuck inside the walls

How are you gonna prove that is the same player kicking first?
If they kick you, you can join other room or create another room.

Read the thread in Help and Support
https://freestylersworld.com/showthread.php?75134-FAQ-Hints-Tips-Solutions-Everything-you-need!
Number 2

Bug issues
some player showing NAT sign and 'fly' up awhile then back to normal
Ping was stable. Mostly happened to (>100)ping for me
Neither me and the players were spiking...