Shadow issues? {SOLVED}

Hi!

I know close to nothing when it comes to CC making, but recently I learned how to make conversions from the Sims 3, and I've done some! I was going to submit my conversion of the floor sculpure that I posted here days ago, on Mod The Sims, but they told me that the object had no shadows at all, so I checked by myself: put my lightning settings on the highest, went to buy mode, and it didn't have any. Not even outside! I also made conversions from a modern dining set, and both chair and table presented this issue. The only object that had an actual shadow outside was the Pharaoh pedestal from WA.

Here's a comparison between my pharaoh pedestal conversion, the knight sculpture from basegame and my floor sculpture conversion that I posted here:




And here's a comparison between my modern dining table conversion, a basegame dining chair and my modern dining chair conversion:



As from the steps i followed, I don't remember doing anything different, I hope you can help me out with this!! 

Thanks beforehand, and have a nice day!