Seeking advice on back taxes owed. Something is very fishy with my ex wife. We divorced in 2019. This year, 2021, she told me we owe back taxes from 2016, and she is paying the full $9K herself. I have never been notified of owing, and have seen zero documentation. Fishy thing is, she was evicted in 2020 and her default judgment was $8,860. I stay on top of my taxes, and just today, I received notice I now owe $2,500, and have zero idea why. Any idea what might be going on?