Making an OMSP. What causes these shadows?

Well, I maaaaybe figured it out. No, the SSAO thing didn't change anything. Here's what I did for anyone interested.

What I did was clone an end table, replaced ALL the meshes (I didn't do this before testing the first time) and with the shadow mesh, (by this I mean the main mesh after assigning a cut number of 0) I deleted all but one polygon of my mesh and resized it so it was extremely small--so small that it's hard to see--and imported that mesh instead of just changing the cut number and not otherwise altering my mesh like I'd normally do. I didn't know this until now, even though I've been making stuff for four years, but the shadow mesh is what generates the sun shadow. Durr *facepalm* Eliminating all but one minuscule polygon of my mesh ensured that no visible sun shadow was present (at least as far as I could see through my testing).

I changed the shader to PhongAlpha. I can still see a very faint outline of my mesh once it's invisible but it's not noticeable.

In the warehouse section, under "lights," I deleted all the occluders as explained in this tutorial: Shadow Tutorial

I made two textures. One with a white alpha for full visibility and the other with a black alpha for the invisible swatch. I left a little tiny white square in the black alpha where the top of my OMSP is located. If I kept the alpha entirely black, I found I could not interact with my OMSP once I'd chosen the invisible swatch. Having a tiny white square in the alpha of my texture meant there was a tiny visible square in the OMSP that I could interact with once the OMSP was invisible.

Also, when making the mesh, I deleted part of and resized the shadow meshes (the flat planes) till they were very small and hid them inside my mesh. This is explained as well in the tutorial I linked above. 

I hope this makes sense!