Why don't the stock prices of good companies always go up?

I am from the Philippines. 1 yr since I started investing. Mostly invested in the S&P 500 because of THIS exact question. Been studying about basic fundamental analysis. and so far what I get is that, you should choose good companies, those whose products are needed, earnings are growing, have a good competitive advantage, among others. In my country, there are various companies whose earnings are growing, have wide economic moats, and are household staples and widely known by everyone. But desp