Line 64 Error Query [alter table dbo.site ADD [store_surcharge] [int] NULL]

Array ( [0] => Array ( [0] => 42S21 [SQLSTATE] => 42S21 [1] => 2705 [code] => 2705 [2] => [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Column names in each table must be unique. Column name 'store_surcharge' in table 'dbo.site' is specified more than once. [message] => [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Column names in each table must be unique. Column name 'store_surcharge' in table 'dbo.site' is specified more than once. ) )