When I select the clay tool and assign it a color, it will create clay in a much darker color. This bug seems to stick with the sculpt permanently - closing and reopening the app doesn't seem to fix the problem. I've run into this bug 3 or 4 times, starting around 2.2.2, but don't have a reliable way to reproduce it. It might have to do with using a custom clay tool. I almost exclusively sculpt with custom stamps.