Why does my code not execute every time

Learn to indent properly your code, it show its structure and it helps reading and understanding. It also helps spotting structures mistakes.

void OnTriggerEnter2D (Collider2D other)
{
    if (other.gameObject.CompareTag("bullet"))
    {
        SkelAnim.state.SetAnimation(0,electrick,true);

        moveScript.WalkSpeed = 0f;

        TakeDamgeEnemy (15f);

    }else{

        electrickcuted -= Time.deltaTime;

        SkelAnim.state.SetAnimation(0,walk,true);

        moveScript.WalkSpeed = 1f;
    }
    if (other.gameObject.CompareTag("WaterBomb"))
    {
        SkelAnim.state.SetAnimation(0,stand,true);

        moveScript.WalkSpeed = 0f;

        TakeDamgeEnemy (50f);
    }else{
        electrickcuted -= Time.deltaTime;

        SkelAnim.state.SetAnimation(0,walk,true);

        moveScript.WalkSpeed = 1f;
    }
}
} // this char does not fit with this code

Indentation style - Wikipedia[^]

Professional programmer's editors have this feature and others ones such as parenthesis matching and syntax highlighting.
Notepad++ Home[^]
ultraedit[^]

Quote:

I have Debug.Log("hit by bullet"); and Debug.Log("hit by water"); thats working ,

Debugging is much more than a log file.
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't know what your code is supposed to do, it don't find bugs, it just help you to by showing you what is going on. When the code don't do what is expected, you are close to a bug.
To see what your code is doing: Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.

Debugger - Wikipedia, the free encyclopedia[^]

Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]
Basic Debugging with Visual Studio 2010 - YouTube[^]

Debugging C# Code in Visual Studio - YouTube[^]

The debugger is here to only show you what your code is doing and your task is to compare with what it should do.

Do you realize what is set by the first if block (the "bullet" one) is then immediately overwritten by the second one (the "WaterBomb")?