My Loading Screen is Stuck at 99%

The issue is that TS3 in particular does not always clear out the contents of RAM when one game session is put away regardless of whether it was saved or not and another is loaded up, which can lead to the data from one game bleeding into another as @GraceyManor describes. It's a design flaw that EA never addressed. The presence of the NRaas Traveler mod makes this more likely to happen, but it has also been known to happen to players who don't even use mods. Best practice is to always quit completely to the desktop, or Origin if relevant, in between loadups no matter how annoying or how long it takes to do that.

I should also point out that your computer is underpowered for TS3. It's a laptop that is designed for portability and it's ability to swivel around into a tablet, not to play graphics intensive games, and it does not have a dedicated graphics card. That doesn't mean you can't play the game on it all, obviously you can as you have been, but the more content and Expansion Packs you throw at it and the longer you play on it, I'm afraid the more likely issues like this are going to arise. :/