When a list is exported by household, it should produce a file containing as many rows (excluding the header) as there are households in the list. There has been a report that some exported lists will include a top row that lists thousands of residents in one household. The address of this household looks to be that of one of residents that should be listed elsewhere in the spreadsheet. It appears that this problem can be circumvented by splitting the list and running a households export of each part. If you experience similar behavior with any of your lists, please comment below!