14 direct reports is a lot. That said an IC / Staff engineer having direct reports is common and often the first step for IC's converting to managers at many of the top tech companies. It's a great way for IC's to test the waters of managerial responsibilities before an official change. They typically operate like this for 9-12 months before deciding whether to continue or going back to IC. Chat with your manager / skip about transitioning to management and where you're at. Assuming that something you're interested in?

I'm interested in being a manager but I'm being told that the title doesn't matter. Is there a difference between the staff engineer pay vs a manager pay? How do I know whether I should be changing my title to manager or senior manager given that my team is of 14 engineers?