None of the objects I'm working with have a stroke on them, however all of them display an outline that shows up through other objects in illustrator. It looks as though I'm in preview mode with colors turned on? I can't figure out how to turn this setting off, help!
You have a stroke applied to the layer: the dot at the right of the layer (target icon) is filled, this means there are some attributes applied to the whole layer:
Read more about the target icon at Adobe.com
Click the target icon at the right of the layer name to select the layer items and check at the Appearance Panel there is no any stroke applied to it