UNet - Commands are sent to server by one client, but not on the other.

Hi. I'm fairly new to Unity/c# and I wanted to make a project that includes networking (maybe I tackled it too early on). I'm using UNET (I know it's getting deprecated).

The problem:
Everything works fine when I have only 1 client connected, but when I built my project and ran 3 instances (1 host, 2 clients) my program began to break. I noticed that:
-I host a server -> Everything is fine.
-I connect to the server with the first client -> Everything is fine
-I connect to the server with the second client -> The second client works fine, but the first stops working properly.
-Whichever client connects last works properly.

Code (csharp):

1.  
2.     //Client code in which I noticed strange behaviour
3.     {  
4.       woohoo = this.gameObject.transform.GetChild(0).GetChild(0);
5.  
6.     if (woohoo.GetComponent<MainCounter>().countOn)
7.     {
8.         audsrc.Play(); //This plays on the broken client
9.         CmdUpdTxt(playerName.text); //But this doesn't seem to execute - why?
10.     }
11.  
12. }
13.        
14.  
15.     [Command]
16.     void CmdUpdTxt(string plyname)
17.     {
18.         woohoo = this.gameObject.transform.GetChild(0).GetChild(0);
19.         woohoo.GetComponent<MainCounter>().Countdown();
20.         RpcUpdTxt(plyname);
21.     }
22.  

Why does that happen :? Any help appreciated .

 

Noticed another thing. If I add "isLocalPlayer" in here:

Code (csharp):

1.  
2. if(isLocalPlayer) // <---------------
3.        {  
4.             woohoo = this.gameObject.transform.GetChild(0).GetChild(0);
5.  
6.             if (woohoo.GetComponent<MainCounter>().countOn)
7.             {
8.                 audsrc.Play();
9.                 CmdUpdTxt(playerName.text);
10.             }
11.        }
12.  

The code doesn't execute -> the sound doesn't play on the broken client but works on the other.

 

Can you just post this script in its entirety?