make marketpress product boxes the same size

I have marketpress with gridmarket child (framemarket parent) theme. If I use the gridmarket default home page the products line up in perfectly in the same size boxes.
Marketpress creates a default store slug where more products are also displayed. In this page the image boxes are different sizes. In marketpress store settings> presentation I set a product list settings thumbnail size of 150x150 because I want all of the images to line up nicely. See the screenshot- they are varying sizes. How do I fix?