There are two possible culprits for this increased shedding:
Shedding is a good sign when taking treatments. Saw palmetto has lowered your DHT levels and the hair now has the time to grow healthy and thicker. The old follicle is being shed while the new thicker follicle will emerge.
Or
Neither of your green tea extract or your Saw palmetto are making a difference and you are undergoing a normal shed due to male pattern baldness.
It is nearly certain that the first outcome is what is happening. It happens with every effective treatment. Enjoy your new thicker hair.