Bills stuck in inventory
I sent one of my sims to pay the bills from the mailbox. This glitched and my sim ended up with 16 bills in her inventory. They have stayed in there despite me saving and quitting many times since. I can't pick them up and therefore can't drag them out. I have searched this issue and it seems to be common amongst university life players, however I do not have this expansion.
@escapedpolarbear Are the bills aging, as in, are they going to come due soon? If so, you should get a prompt to pay them, in the upper right corner of the screen, when you have 24 hours left to pay them. You can then just click the button to pay, and the bills should disappear. And if the cost is higher than it should be, you can always just fix that with money cheats.
There are ways to try to reset the sim, for example evicting her and moving her back into her house. (As always, this will reset her promised dreams and opportunities, but she'll keep her job and relationships.) There's also a mod that can flush stuck objects, if you're interested.