Display issue in blog FrontEnd versus Backend

I did create a template for my blogs and I a section, in a row (full width) I did 4 images. In the backend display is ok but in the front end, there is a space like if I could add another image. Which is NOT the case in the backend.

First picture is Backend 2nd is Frontend and I don't know why...
Can you help me out?
Thanks
Dany

 

Hello !

This is our url
https://wickiup.ca/accueil/

You can click on any rooms in the menu.
At the beginning I put 3 pictures, then changed it to 4 thinking it will fill the gap but even with 4 there is still another gaop

 

Hello! It is working in the backend and connected as admin when we view the page.
But as a customer it doesn't show the new images either 4 pictures per row. I did flush cache memory of the browser, tried icognito also. I also flushed divi Static CSS File Generation in Divi theme options/builder/advanced

I don't know what else to do!