Aligning Euro Symbol to left adds value for some reason

If I add this filter-

http://www.gravityhelp.com/documentation/page/Gform_currencies

To my functions.php file, and modify it so that the euro symbol is on the left hand side of the value ( ie €100.00 instead of 100,00€ ) then the position of the decimal gets messed up. Any product that I have set at €100.00 instead becomes €10,000.

Any ideas why this would happen? The only thing I have modified from the example on the page mentioned above is that the euro symbol is on the left instead of the right, so my code looks like this:

<?php

add_filter("gform_currencies", "update_currency");
function update_currency($currencies) {
    $currencies['EUR'] = array(
        "name" => __("Euro", "gravityforms"),
        "symbol_left" => "€",
        "symbol_right" => "",
        "symbol_padding" => " ",
        "thousand_separator" => ',',
        "decimal_separator" => '.',
        "decimals" => 2);

    return $currencies;
}

?>