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Unwanted tags added to emails

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Daily while using Thunderbird 38.4.0 my emails in the list will change colors to indicate they have been tagged. This happens spontaneously and without my consent. How do i stop it?

Daily while using Thunderbird 38.4.0 my emails in the list will change colors to indicate they have been tagged. This happens spontaneously and without my consent. How do i stop it?

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Are you pressing the number keys? The numbers keys are shortcuts for tags.