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What you are seeing in the screen shot is basically a behaviour Marketo uses when you run multiple list imports. You may not have an address field in this current list, but you may have had it in a previous list in where you attempted to map a "blank column name" to "address". Marketo tries to identify that and apply that on your next list upload. Also from the looks of the screen shot, while there may not be a sample value shown, if you go back to the list that you are trying to import, can you see if there are additional columns where there is data? If there is data in that column but no column name, then Marketo is just attempting to do what would have been done before that is a map the blank column name to Address.
You have to ensure that your list column names which are on the top row of your list match what Marketo accepts as a default. If you are going to change a field name, Marketo assumes that all the other column names have changed and looses the behavioural mapping.
Now you can set your own list import alias for each field in Marketo. You would need to go to Admin->Field Management->"Select the field you want"->Field Actions->Edit List Import Alias. That should help you define a structure when you are trying to do a list import.
Hope this helps