When people are playing a mod that i dont have in toribash it doesnt load so
I need to rejoin the server


Why does this happen?

Because you dont have the mod ... -_-

you have to reconnect .. there is no other way i think ....

You'd need to download the mod to play IIRC

You have to download mods you don't have, or /rec the current session, some mods don't download on old versions, you can do /rec to usually fix them or download that mod on the forums, you can search for the mod probably the easiest on google, toribash (mod name)
hope that helped.