checked it out for a few minutes, and I've run into two curious things...
first the People sector has only space for two cards horizontally even though visually it seems like 3? I can't manually place a card there in the rightmost position. It can land there if automatically generated but it gets destroyed.
Second, I had a card created by solving an event (Pollution Regulation) land under another card in the industry sector (Hydro Energy) and had to drag it out from under it to see it (if I didn't it's like I had one more space?). When I reloaded the game, the Hydro Energy card was gone...