Can someone help me? I think I made a setting and I don't know how to revert it. My brushes are transparent over the painting, and it's not due to the opacity or the paint flow, and where the selected color in the brush should appear, there's a symbol of a chain.
It looks like you're using a Watercolor/Oil brush with a multicolor swatch. Would you mind switching to a solid color or resetting the brush settings to see if it helps?