I just did the December store files, since I wasn't sure if I had included those, to make sure that it wasn't a December issue, and the screen closely resembles what I got when doing the whole thing. While I admit I haven't had time to thoroughly check each item, nothing exploded when I went in-game. I would be interested in seeing if the conflicts are indeed superfluous, or if there's a deeper issue.

Are you sure you were importing them correctly? I merged all of the store .package files by going to File > New in s3pe and then Resource > Import > From .package... and selecting them all, hitting Open and letting it run. I remodeled my nursery with some store objects and everything worked fine. Maybe you selected import from file? Something like that happened to me when I wasn't paying attention and did it that way.

This is rather odd. I admit that my graphics card fails hard, and I wasn't expecting it to run Sims 3 to begin with, but it did. However, after I patched Sims 3 to 1.8 the map started glitching. It doesn't do it in Edit Town mode, only when in an active household. I'm wondering what could have happened that made it suddenly start happening when it had been running along (at low quality) perfectly fine before I patched about a week ago. The only mods I have in are AwesomeMod and Ruleof6.

ETA:
It's in Sunset Valley, so it's not a Riverview problem. Also, it's the Awesomized version from the Pudding Factory.