New Android User: Everytime I add pictures to my phone, they get duplicated. Why?

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http://forums.androidcentral.com – Hello everyone, Brand new Android user here. Just got my Nexus 4 a couple weeks ago. Here's my problem: I have about 30 pictures on my Dropbox. Using the Astro File Manager I connected to my Dropbox account and I copied all of those pictures and then pasted them under storage > sdcard0 > Pictures.After a while I noticed that all of these files were now appearing under storage > emulated > 0 > Pictures as well. And if I go to my Gallery app the 30 pictures are listed twice under two separate, identically named, folders.If I delete one of them, eventually they both disappe (HowTos)