Your question is in regards to the plugin, so are you using the plugin’s export process, or is this a direct db dump? The way you worded your question, it sounds like you are outputting the table directly?
If that’s the case, there will not be meta keys for which there has never been data entered. For example, in the case of activate field, this isn’t set upon registration. So if the user has recently registered, and has not been activated, there is no meta key for this. If the user has not entered data for a field that may not be a required field, there would be no meta key for that field for that user. That would be the case if Company Name and Account No fields are not required – if there’s no data entered, there is no meta key.
There is a user export process within the plugin. That would provide you a cleaner export than accessing the db directly.