Explain where she bought this re-entry permit you think the 're' refers to. At the embassy? At the local supermarket? On the street corner? Think about it for just one moment.
You have the correct amount of days for an initial non-imm entry the 're' means re-entry They have stamped you in for the correct amount of time, but for the wrong reason. I would still go back to the airport to get it corrected to stop any problems when and if they come to extend.