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There could be several reasons why CSS styles still clash despite implementing CSS modules in React.

1. Component nesting: If a component is nested inside another component, the styles applied in the parent component may affect the child component. In such cases, the styles applied in the child component may overwrite the styles applied in the parent component.

2. Global styles: If there are global styles applied to the application, it can lead to style clashes. CSS modules only apply to local styles and not global styles.

3. Specificity: The specificity of the CSS selectors can also cause style clashes. If two or more selectors have the same specificity, the styles applied to them may clash.

4. CSS precedence: CSS properties that are declared later in the code may take precedence over those declared earlier, leading to style clashes.

To avoid style clashes, it is essential to write modular and specific styles and follow best practices such as avoiding the use of global styles and maintaining a consistent naming convention.