Issue with dataframe package

[abis866c]

I have installed the dataframe package and loaded a dataset of size 4216x7
from a csv file. I have one column that holds the name of a zip file
(something like "chester.zip") All data is good in the dataframe except for
the rows where the zip file name starts with "na", for example ,
"nabuco.zip". The string in that cell is not loaded correctly and it is
considered a missing value (NA). 
I am very confident this is due to the fact that string starts with "na"
because if I add "_" at the beginning of the string to make it
"_nabuco.zip", string is loaded correctly.
Any suggestions on this?



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