How can I insert multiple page contents in the page layout properly?

I wanted to create 4 columns on the page layout. These 4 columns are of page contents.

After creating new web page based on that page layout, I attempted to enter 4 different inputs on all 4 columns.

Then, the result (from all columns) becomes the same.

Image - edit the web page based on 4 columns page layout:

Image - after edit & save:

How can I insert multiple page contents in the page layout properly?