some players are invisible?

[SuPeR Swat]

sometimes when i play i hit something invisble and i ask what it is and someone says its me but i cant see them, does anyone know why people turn invisible to me sometimes?

[Ad Bot]

[Grimreaperx15]

What server(s) does this happen on? Some servers have scripts to turn you invisible.

[Badspot]

There's a glitch that seems to be appearing more and more lately where mounting gets de-synced.  You see the player as mounted on a jeep but they are actually running around somewhere. 

[SuPeR Swat]

What server(s) does this happen on? Some servers have scripts to turn you invisible.

happens on my server

[Packer]

Sounds like somebody's Add-ons are screwing around with things.