disable Add to wishlist

Hello,

First, note with your provided link we are unable to experience your described issue.
But without seeing the context this kind of behavior seems to suggest that there are customizations because either you have your buttons for any type of product, main or variants.
So maybe your solution, is to use custom Css :

.hikashop_product_page button.hikabtn.hikawishlist {
    display: none;
}