CTYPE inconsistency in header for data in spectroscopic mode

For dataset in spectroscopic mode, the first axis seems to be always wavelength.
But this is not consistent with the CTYPE-i keywords later.

e.g.

SIMPLE  =                    T / conforms to FITS standard                      
BITPIX  =                   32 / array data type                                
NAXIS   =                    3 / number of array dimensions                     
NAXIS1  =                 1010 / Length of data axis 1                          
NAXIS2  =                  484 / Length of data axis 2                          
NAXIS3  =                    1 / Length of data axis 3        

FILENAME= 'gris_20160613_120408_l1s_008_120_0029.fits' / Name of file           
EXTNAME = '20160613_008_120_0029' / Unique HDU name                             
POINT_ID= '20160613_008'       / Unique (re-)pointing ID                        
OBS_TRGT= 'Sunspot(s)'         / Observation Target                             

WCSNAME = 'Helioprojective Cartesian' / nan                                     
CTYPE1  = 'HGLN-TAN'           / Type of coordinates along axis 1               
CUNIT1  = 'arcsec  '           / Units along axis 1                             
CRPIX1  =                    0 / Reference pixel                                
CRVAL1  =              297.671 / Value at reference pixel on axis 1             
CDELT1  =             0.080792 / Sampling along axis 1                          
CSYER1  =                 1900 / Systematic Error along axis 1                  
CTYPE2  = 'HGLT-TAN'           / Type of coordinates along axis 2               
CUNIT2  = 'arcsec  '           / Units along axis 2                             
CRPIX2  =                    0 / Reference pixel                                
CRVAL2  =              408.258 / Value at reference pixel on axis 2             
CDELT2  =             0.080792 / Sampling along axis 2                          
CSYER2  =                 1900 / Systematic Error along axis 2                  
CTYPE3  = 'WAVE    '           / Type of coordinates along axis 3               
CUNIT3  = 'Angstrom'           / Units along axis 3                             
CRPIX3  =                    0 / Reference pixel                                
CRVAL3  =            10823.076 / Value at reference pixel on axis 3             
CDELT3  =             0.017998 / Sampling along axis 3                          
CSYER3  =             0.017998 / Systematic Error along axis 3