Why is my Coroutine not stopping?

Questions & Answers
1

Whenever I press shift and let go, the stamina keeps on regenerating until it reaches 100. Or in some cases if I press shift and let go, it will regenerate ~10 stamina, and then stop and start over again.

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2

Try this code

private void Sprinting()
{
    if (Input.GetKeyDown(KeyCode.LeftShift) && !isSwimming && !isCrouching && currentStamina > 0)
    {
        isSprinting = true;
        if (staminaRegen != null)
        {
            StopCoroutine(staminaRegen);
        }
    }
    // Check for releasing the Left Shift key separately
    if (Input.GetKeyUp(KeyCode.LeftShift) && !isSwimming)
    {
        isSprinting = false;
        moveSpeed = moveSpeed2;
    }

    if (isSprinting)
    {
        moveSpeed = moveSpeed2 + sprintMultiplier;
        currentStamina -= (staminaDrain * Time.deltaTime);
    }

    if (!isSprinting)
    {
        // Start stamina regeneration coroutine if not sprinting
        if (staminaRegen == null)
        {
            staminaRegen = StartCoroutine(StaminaRegeneration());
        }
    }

    UnityEngine.Debug.Log(isSprinting);
    staminaBar.value = currentStamina;
}

// …

IEnumerator StaminaRegeneration()
{
    yield return new WaitForSeconds(2);
    if (currentStamina < maxStamina)
    {
        currentStamina += staminaRegenRate * Time.deltaTime;
        staminaBar.value = currentStamina;
    }
    yield return regenTick;
    staminaRegen = null;
}