SO - xlsread matlab changes values when load

>> [~,~,a] = xlsread('11.xls.xlsx',2) % http://stackoverflow.com/questions/20020359/xlsread-matlab-changes-values-when-load#comment29814341_20020359

a =

    'Subject'          'C'         [NaN]    [NaN]    [NaN]    [NaN]
    'Age'              '80'                     [NaN]    [NaN]    [NaN]    [NaN]
    'Height'           '150 cm (5' 0")'         [NaN]    [NaN]    [NaN]    [NaN]
    'Weight'           '50 kg (129.0 lbs)'    [NaN]    [NaN]    [NaN]    [NaN]
    'Gender'           'Male'                   [NaN]    [NaN]    [NaN]    [NaN]
    'Handedness'       'Right Handed'           [NaN]    [NaN]    [NaN]    [NaN]
    'Smoker'           'Smoker'                 [NaN]    [NaN]    [NaN]    [NaN]
    'Serial Number'    '15651651'                [NaN]    [NaN]    [NaN]    [NaN]
    'BMI'              '18.51'                  [NaN]    [NaN]    [NaN]    [NaN]
    [          NaN]    [                NaN]    [NaN]    [NaN]    [NaN]    [NaN]
        [1x28 char]    [                NaN]    [NaN]    [NaN]    [NaN]    [NaN]