CSS problem when adding data with javascript after visiting the page

CSS problem when adding data with javascript after visiting the page

I have a problem adding with JS content to a visited page. For example I add the 2 first items without problem, then I visited this page, and after I added the third product with the CSS problem as you can see (the text doesn't respect the indentation).

I add the information with 
ulCart.innerHTML += liElement;

I have to do this using different command o do something more after update the information?

I really appreciate your response.