I agree. And install a new wax ring. The looks of the old wax ring on the top side doesn't appear it was even touching most of the way around.It looks like the floor was retiled and now the flange is too low. The flange should sit above the finished floor. Get a flange extension to bring the flange higher and reinstall toilet.
Just to be sure, the plastic funnel should be on the underside, protruding into the drain. Installed as shown, it will leak. Just covering every base.Here is the ring and flange from topside. The subfloor immediately surrounding the bowl is soaked - my guess is this has been constantly leaking or leaking every flush. We've been here for one month.