User blog comment:DaNASCAT/Update Your CSS and JavaScript To Speed Up Your Wiki/@comment-188432-20120823005928/@comment-4674838-20120823025006

You can't combine style and script in one  call like that, the note at the bottom of the help page says "All of the articles in a single method call must be of the same type." to try to deter you from doing this.

What happens in your sample code is that when  appears a 2nd time, it overrides the 1st occurrence. There is only a single  property to the object. An object can't have 2 different properties with the same name.