The last (fourth) argument that you pass to wp_set_object_terms() is true, which, “If true, tags will be appended to the object. If false, tags will replace existing tags”. It sounds as though you are instructing wp_set_object_terms() to do, if I understand you, exactly what you don’t want it to do. I think that you need to set the last argument to false or just leave it out, as false is the default.
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