GetItemUrl returns invalid url

[AfshinZavvar]

I had a list of articles to be retrieved as I found out that for some of articles, url is mydomain.com/articles/article1 but for some other is like /sitecore/content/home/articles/article1

So I changed
return LinkManager.GetItemUrl(item);
With
return LinkManager.GetItemUrl(item, UrlOptions.DefaultOptions);