You posted
Code:
// page title
define('TITLE', 'MoonCave Crystals');
// Site Tagline
define('SITE_TAGLINE', '');
// Custom Keywords
define('CUSTOM_KEYWORDS', 'pebbles, tumbles, crystal, crystals, incense, lemurians, lemurian, smudges, quartz, moonstone, peridot, carnelian, citrine, rock, rocks, garnet, lithium, beta, coral, angelite, celestine');
I posted
Code:
// page title
define('TITLE', 'Zen Cart!');
// Site Tagline
define('SITE_TAGLINE', 'The Art of E-commerce');
// Custom Keywords
define('CUSTOM_KEYWORDS', 'ecommerce, open source, shop, online shopping');
Those blocks of code don't look similar to you? 
Add this under your keyword definition and see if that helps:
Code:
// Home Page Only:
define('HOME_PAGE_META_DESCRIPTION', '');
define('HOME_PAGE_META_KEYWORDS', '');
// NOTE: If HOME_PAGE_TITLE is left blank (default) then TITLE and SITE_TAGLINE will be used instead.
define('HOME_PAGE_TITLE', ''); // usually best left blank