Absolutely 100% positive, I had just over 22,000 and after had just over 17,000 and saw the -5000 float up the screen.
I still have the 17k so it's not a huge issue it's just never happened before, I had been collecting a lot, got lucky with finding all gems and metals so got a heart cut pink diamond and some extra plutonium, hence the nice sum of money in just over a week. I hadn't been spending it as I'd planned to build a proper house after the move.
I just wondered if this was a known bug or not and if the pet adoption thing had caused it, but from your comment it sounds like it isn't, she already moved somebody else in to help paint her portrait and that worked like normal. Although she didn't bring much as her family were poor, his is rich which is why I didn't expect him to steal my money, can't trust klepto's at all.