What washing powder do you use? Never use one that has "optical brighteners" in the ingredients. They can sometimes bleach your clothes. Always use a washing powder specially made for colours (or at least hasn't got optical brighteners in them). Although most colours/dyes are not affected by these additives, some dyes do bleach when using them.
How mysterious! It really does sound like bleach to me, but Napisan has never done anything like that to any of my coloureds. Are you sure there's no Exit Mould or similar in the house that someone may have been using?
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