About Slider and pause,About Slider and Pause

I made a hp bar and pause button.

Then i used this script to pause button.

public void OnClickIsPause()

{

ispause = !ispause;

if(ispause)

{

Time.timeScale = 0f;

}else

{

Time.timeScale = 1f;

}

Time.fixedDeltaTime = 0.02f * Time.timeScale;

}

Then, After I clicked PasueButton, All things stopped.

But hpbar was changed when i press w, s, UpArrow, DownArrow.

Although I never used w, s when i make script.

I found the soultion from https://answers.unity.com/questions/1436116/weird-ui-slider-behaviour.html

But I have a question.

Hpbar was changed by w, s, UpArrow, DownArrow only after I clicked PauseButton.

Before I click PauseButton, hpbar never changed by w, s, UpArrow, DownArrow.

i don't know why... my script for pause button is wrong?

Thank you for reading.