Admin>Modules>Payment.
I know you looked, but EVERY icon under Orders Status should be red, with the exception of PayPals Status, which should be green. So, if you have some icons besides PayPals' that's green, be sure to un-install those. If any icons are orange, you may want to un-install those, too.
At any rate..................if PayPal's the only payment module that's installed, then it should be the only one to be shown.
Let us know if this helped, or if you've still got a problem with this, as if they are all un-installed besides PayPal, and others are still showing, then something's definitely wrong.
Teach them to shop and they will shop today;
Teach them to Zen and they will OWN a shop tomorrow!