CSS / JS files replicating in Uploads folder NEED HELP

Dear WPMU team,

I installed a 30-day trial of your plugins, and I'm having an issue with the Uploads folder on my site. There are many css and js files that are replicating, and I don't know whether its because of the plugins or possibly a hack. Please let me know what i can do about this.

Let me know if you require my login details - I-ve already enabled Support Access for 5 days.