Just to be safe, see if you can run a hose, or pour a pitcher of water
down the drain and see if it still leaks. I don't think a wax ring
that had a shifted funnel could have caused the leak, but since you
have everything off, might as well test it now. The leak might be
from the elbow or lead bend if you have one.
If everything looks good, then it probably was the old wax ring. The
new wax rings with the funnel are made pretty good.
If the flange is fairly straight, and a little off level, it should
not be a problem.