The file:-
includes/languages/english/product_info.php
... was probably edited at some stage (probably to remove the brackets).
If you open that file - (in your case it may be):-
includes/languages/YOUR-LANGUAGE/product_info.php
PHP Code:
define('ATTRIBUTES_PRICE_DELIMITER_PREFIX', ' ( ');
define('ATTRIBUTES_PRICE_DELIMITER_SUFFIX', ' )');
If you do not want the brackets, then delete only the brackets INSIDE the single quote marks, so you get:-
PHP Code:
define('ATTRIBUTES_PRICE_DELIMITER_PREFIX', ' ');
define('ATTRIBUTES_PRICE_DELIMITER_SUFFIX', ' ');
You MUST LEAVE the single quote marks - even though there is nothing between them now. If the quote marks are deleted, you will see this in your shop:-
ATTRIBUTES_PRICE_DELIMITER_PREFIX XXXX ATTRIBUTES_PRICE_DELIMITER_SUFFIX
... which is what is happening.