Random money appearing in my household!?

Okay so I'm lowkey not complaining but I'm just confused. So my sims have been struggling with money but I finally got them to the 44k they needed to move and so they had like 2k after moving. I got them up to like 8k i think and then randomly they have 28k? I'm really confused because they shouldn't have anymore than 10k. Is anyone else having this issue?