Struggling with Grid:Strips sizing and text issues.

Hey everyone! I am struggling with building my portfolio on Squarespace, and I'd really appriciate some help ❤️

I am trying to have a single row of images you can click through, and it's looking exactly like what I want in the preview, but when I save and look at my site, it splits it into multiple rows.

This is what it's looking like, and here is what my settings for the block are:

But here is what it is looking like in the final website:

On a side note, not as important, my text in the preview is wayy smaller than what it exports in the final, and I'm perplexed ahaha. It works for me but it is a bit annoying to work with. Thanks so much! 

Preview:

Final:

Here's my site for those who need it: https://www.isabelleackroyd.com/