The export is correct, as @Frazz says there is "one line in csv for every row in excel file", if you want all the numbers in one line, there are several ways, i will use this PHP script:
<?
$file = file_get_contents("your_export_file.csv"); //Name of your file
$replaced_data = str_replace("\n",",",$file);
file_put_contents("new_export_file.csv",$replaced_data); //Desired name
?>
If you don't have PHP installed perhaps an advanced editor (Notepad++, Sublime, Eclipse, Netbeans,..) could do the job, just replace \n
for ,