SOLVED:
Change theme.css file:
.products .product-miniature {
margin: 10px 0 10px;
position: relative;
min-height: 400px;
QUESTION:
What do I need to change within the code so my product list page doesn't randomly display "blank" squares between products?
The only pattern that I am seeing is that the 1st and 2nd columns are blank, but it is not always every other row.
Each page is correctly displaying 30 items