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We describe the evolution of weak magnetic fields in a quiet region observed at the Big Bear Solar Observatory on 1 October 1996. We observed puzzling changes in which one polarity changed without corresponding increases or decreases in the other. In the rest of the same field, no special changes were observed, and a search of nearby days revealed no similar changes. We do not wish to call Maxwell's laws into question, we simply state that there are surprising effects that we cannot understand with current models.