Related products are not nicely alligned

Well there is a couple reasons,

1. You have an older version of the theme, why not upgrade?
2. A lot of your images are too small so they can’t be sized properly so that the theme can make them all the same size.

but if you want to leave as is you can try adding this to your custom css box:

.product_item a.product_item_link {
height: 270px;
overflow: hidden;
}
.product_item .product_details a.product_item_link {
height: auto;
}

Kadence Themes