Hi,
Change the code:
if(function_exists('imagecopyresampled')) {
			imagecopyresampled($ret['res'], $source['res'], $x, $y, 0, 0, $sx, $sy, $origin_width, $origin_height);
		} else {
			imagecopyresized($ret['res'], $source['res'], $x, $y, 0, 0, $sx, $sy, $origin_width, $origin_height);
		}to:
if(function_exists('imagecopyresampled')) {
			imagecopyresampled($ret['res'], $source['res'], (int)$x, (int)$y, 0, 0, (int)$sx, (int)$sy, (int)$origin_width, (int)$origin_height);
		} else {
			imagecopyresized($ret['res'], $source['res'], (int)$x, (int)$y, 0, 0, (int)$sx, (int)$sy, (int)$origin_width, (int)$origin_height);
		}in the file administrator/components/com_hikashop/helpers/image.php and it will remove these messages.
We'll add the change on our end too for the next version of HikaShop.