ADD TO CART DISAPPEAR

I have a problem, althought the text of button add to cart it appears in the page where are all the products, when I go inside one product to see details, the text in the button add to cart is disapper??? See photo. What must I do??

I don't experience that , when I go to :

pharmacy-cosmetics.gr/index.php?page=sho...irtuemart&Itemid=217

Well Ivan I try to enter as a visitor and I couldnt add a product because it was as the photo I send u ?????

Well Ivan I try to enter as a visitor and I couldnt add a product because it was as the photo I send u ????? Ivan select a product and see inside the details no outside where there are all the products
example:

www.pharmacy-cosmetics.gr/index.php?page...irtuemart&Itemid=217

Again i see nothing odd? I fixed ask question thing.