Ideas
I've been having the same problem for a few weeks. It's so annoying that I've just stopped playing, but today I tried again and nope, still happening. I just need to take things out of my sim's fridge and put them in her inventory so I can sell them at the finchwick fair, but when I click on something in the fridge and try to put it in her inventory, it either stays stuck in the cursor-hand, or goes in her inventory but the next item in the fridge instantly automatically appears in the cursor-hand. After that happens, I can't pick up anything else or drop what's in the hand. Also, the little sim inventory button on the bottom right of the screen keeps the little circle around it, even after I've closed the fridge and sim inventories. When I open any other inventory after that, or reopen the sim inventory, whatever that last item was that had been in the cursor-hand is still there, in the cursor-hand. Trying to click on other things doesn't help, I always just have to quit without saving. It makes finchwick fair in particular unplayable. Cottage Living is the only reason I still play sims 4, so as long as this keeps happening, the game is completely unplayable for me.