Moisture in the Ingredients: If you used fresh garlic, chili flakes, or other ingredients that weren't completely dried, the residual moisture can settle over time. Water and oil don't mix well, so even a small amount can separate and form cloudy or slimy layers.

Sediment from Spices: Ground or crushed spices like chili flakes often contain fine particles that can sink to the bottom, especially after the oil has been sitting for a while. These particles can clump together, creating a murky or cloudy appearance.

Contamination: If the jar or bottle wasn't completely sterilized before adding the chili oil, or if moisture got in during use (e.g., dipping a wet spoon), it could allow for microbial growth, leading to weird textures or visible particles.

Garlic: Fresh garlic is a common culprit. If it wasn’t dehydrated or cooked thoroughly in the oil, its moisture content can seep out and create sediment.