1. Not enough marinating time: garlic chili sauce needs a certain amount of time to ferment, if not enough time, it may result in an undercooked or overly sour taste.

2. Putting too little salt: Salt not only helps with preservation, but also enhances the taste and flavor of garlic chili sauce. If you put too little salt, it may cause the garlic chili sauce to become stale and sour.

3. Poor sealing and preservation: If the garlic chili sauce is not well sealed and preserved, airborne bacteria and oxygen may enter and cause the garlic chili sauce to ferment and turn sour.

4. List of ingredients: chili peppers, garlic, ginger, apple cider vinegar, sugar, salt, red oil, and pepper powder.

5. Steps to make: put garlic, ginger, apple cider vinegar, sugar, salt, red oil, and pepper powder into a blender and puree, then cut the chili peppers into small pieces and add them, and mix well.

In summary, to solve the problem of garlic chili sauce turning sour, you can try to extend the marinating time, increase the amount of salt, or improve the sealed preservation conditions. At the same time, pay attention to the list of ingredients and the production steps, avoid adding unnecessary ingredients or steps to ensure the flavor and quality of the garlic chili sauce produced.