The title bar seems to showing in the Windows style even though it's on Ubuntu. This only started happening recently. Is it a bug or do I need to change some setting?

I personally find Aria very impressive but, the other day I discovered that my daughter has been sending Aria her homework sheets for Aria to answer! OK so this isn't a serious problem but I would like it if Aria could spot this and talk about the importance of human education too! Aria could even help by explaining the answers rather than just serving them. Aria even said it was 'happy to help' which basically encourages my daughter to keep skipping homework.

I also don't understand why the title bar buttons have moved to the right to match the Windows style rather than unix

The title bar seems to showing in the Windows style even though it's on Ubuntu. This only started happening recently. Is it a bug or do I need to change some setting?