The command "describe test_table", displays different datatype

Hello All,
I have a strange issue in my Oracle 12c, I'm have a database gateway setup to connect to a Microsoft SQL through dblink using ODBC 64 bits driver
All works fine but I noticed that some columns in the oracle tables that I'm merging from microsoft sql don't display the values even though in the microsoft SQL they are there
I noticed that in the SQL the datatype of the column is VARCHAR while if I describe the table from within oracle I can see that column as NVARCHAR2
I also noticed that some columns don't even display in Oracle and they are NVARCHAR in Microsoft SQL
I was thinking that it may be due to characters conversion but not sure
Anyone ever had this problem ?
Thank you

Hi Matt,
thanks for your reply, I have checked and here is the output:
SQL> select * from v$nls_parameters;
PARAMETER            VALUE                    CON_ID
NLS_LANGUAGE         AMERICAN                      0
NLS_TERRITORY        AMERICA                       0
NLS_CURRENCY         $                             0
NLS_ISO_CURRENCY     AMERICA                       0
NLS_NUMERIC_CHARACTE .,                            0
RS
NLS_CALENDAR         GREGORIAN                     0
NLS_DATE_FORMAT      DD-MON-RR                     0
NLS_DATE_LANGUAGE    AMERICAN                      0
NLS_CHARACTERSET     WE8MSWIN1252                  0
PARAMETER            VALUE                    CON_ID
NLS_SORT             BINARY                        0
NLS_TIME_FORMAT      HH.MI.SSXFF AM                0
NLS_TIMESTAMP_FORMAT DD-MON-RR HH.MI.SSXF          0
                     F AM
NLS_TIME_TZ_FORMAT   HH.MI.SSXFF AM TZR            0
NLS_TIMESTAMP_TZ_FOR DD-MON-RR HH.MI.SSXF          0
MAT                  F AM TZR
NLS_DUAL_CURRENCY    $                             0
NLS_NCHAR_CHARACTERS AL16UTF16                     0
PARAMETER            VALUE                    CON_ID
ET
NLS_COMP             BINARY                        0
NLS_LENGTH_SEMANTICS BYTE                          0
NLS_NCHAR_CONV_EXCP FALSE                         0
19 rows selected.

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