Hi,
I can see you are using masonry layout for your grid. Please take note of how masonry works.
Masonry is a grid layout based on columns. Unlike other grid layouts, it doesn’t have fixed height rows. Basically, Masonry layout optimizes the use of space inside the web page by reducing any unnecessary gaps. Without this type of layout, certain restrictions are required to maintain the structure of layout.
Here is a good explanation of how it works
By choosing masonry plus having different image size your grid will always not look the same.
For more infomartion regarding different grid layouts, please refer to the link below
https://www.themepunch.com/essgrid-doc/core-anatomy-of-an-essential-grid/#grid-layout
Hope that helps