MySQL statement becomes corrupted during query

I am making a custom wordpress page with php. When I execute the request it gives below error:

You have an error in your SQL syntax; check the manual corresponding to the MySQL server version for the correct syntax to use next to 'brand VARCHAR (70), serialCode VARCHAR (70), QRCodeAddress VARCHAR (70), email VAR' on line 1

As you can see, you can see a strange char that usually comes from an encoding problem. But I am surprised that if I iterate over my sql expression it has no problem. See below:

CREATE TABLE SerialTable(id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,brand 
VARCHAR(70),serialCode VARCHAR(70),QRCodeAddress VARCHAR(70),email VARCHAR
(70),sex VARCHAR(70),age VARCHAR(70),purchasePath VARCHAR(70),expiryDate 
VARCHAR(70),registeredDate VARCHAR(70),modelName VARCHAR(70),colorCode VARCHAR
(70))

      

        
        
        
      

    

And it even works well if I love the MySql shell.

My procedure is this:

• I am reading a UTF-8

csv
  
  file to read table column information.
• Depending csv
  
  on the file information, make the SQL statement as above and store it in a variable$sqlStr
  
  
• when i echo $sqlStr
  
  it has no syntax error and even works in the MySql shell.
• But when $wpdb->query($sqlStr)
  
  , it gives an error as above.
• I have tried using mysqli_query($conn, $sqlStr)
  
  . and it gives the same error.

MySql Server Information:

Of course the connection is localhost as long as the web server and mysql server are on the same machine.

MySql server collation : utf8_general_ci
mysql server charset : latin_swedish_ci

      

        
        
        
      

    

I tried to fix this issue for over 48 hours and got completely stuck?