Why are developers like this?

I’m currently doing PO work and PM work and having a breakdown communication with one of my developers. I give the user problem and outcome, the context, the acceptance criteria, designs etc. We discuss the ticket at backlog refinement, sprint planning and (if a large piece of work, when the ticket is started during the sprint) annnnd when we come to test it, it’s over engineered, not always what is required and I’m pretty sure built with AI. They expect