Many times when I paste from Internet, the lines are joined and the text does not look same. Why?

This is a browser problem. The browser does not copy RTF format to the clipboard with proper line breaks. By default, WhizFolders tries to paste RTF but that is copied wrong from the browser.

You can instead use “Paste Plain Text” operation which will put the line breaks properly. You can also try Paste Special in the editor and then select Unformatted Text to be pasted.