Summary view of Posts List rendering differntly in different environments

I have a summary view of Blog posts list displayed in a page, But these are getting rendered differently in different environnment as shown below.You can see Date section highlighted is getting rendered differently.I want it to render it like image 1 below.

1)

2)

The date section should be made as in image 1 

How to make these changes on to this view.Any pointers will be helpful.