Post Template sizing ignored with query loop block

I’m having problems with the Post Template sizing when using the post query block. It looks good in the editor but the layout is lost on the actual page. Here’s what it looks like in the editor:

In the editor I see the following css to force the width of each post template to be 25%:

.gb-post-template-9c9f123f > .gb-post-template-wrapper > .block-editor-inner-blocks, .gb-grid-wrapper > .block-editor-inner-blocks > .block-editor-block-list__layout > .gb-grid-column-2587f525 {
    width: 25%;
}

However, there’s nothing in the css on the actual page to force the width to be 25%. Also the background color on the post template is lost.

The page I need help with: [log in to see the link]