EMPSAME Response for Missing Months

I am using the EMPSAME variable which asks if your employer is the same this month as the previous month. From this wording, my understanding is that if someone doesn’t answer the survey in one month, then EMPSAME should be missing the following month. However, I have found a few thousand people who do not have an observation for the previous month’s survey, but still answer “no” to EMPSAME indicating they have switched employers. For example, someone who has an observation in MIS = 4 and one in MIS = 6 but MIS = 5 is missing. However, for MIS = 6, EMPSAME is not missing. Is this a mistake? IF not, which employer are they referring to when they ask if the person has switched employers, the employer in MIS = 4?