This is probably due to overrotion in your throw. Remember to keep things in line. Be especially watchful of your clear arm and don't let it whip around aimlessly. OVER THE TOP.
2) Low throws
Two factors: angle and height of release. First make sure you are up tall when you release. keep your stomach muscles tight (try a grunt) so you don't crunch down. Then check to make sure you are releasing the shot put at a 45 deg. angle (its higher than most people first guess). Also make sure your arm follows a 45 deg line throughout the throw through the release point and slightly after ... Many athletes aim up and lower it mid throw.
3) Not watching the release / Lack of focal point
This leads to many shot put injuries, as it threatens your shoulder, elbow, wrist, and hand. Not only that but if you're not watching your release, you will lose control of the shot leading to a mediocre throw as it rolls incorrectly out of your hand. Watching the shot, allows you to fully transfer the power you've built up and transfer it to the shot. Use the shot as a focal point.
4) Too high in the glide
a) hopping to high as you glide across the circle
b) raising the trunk during the glide
Both of these prevent you from developing max. force by taking some of the momentum away from the direction of the throw. Keep low, especially the left drive leg.
5) Blocking / In the bucket
a) Blocking: left foot is further right than the right foot. This prevents the hips from opening up which prevents max. use of the legs.
b) In the bucket: The left foot is way left of the right foot. This prevents you from driving straight over your power leg - a major power outage!!
Use a series of stop and go throws. Have the athlete glide into the power position and stop. Correct if needed (not close to heel(instep)-toe alignment). Stand throw.
6) Shifting Weight Forward
Here, the athlete prematurely shifts the weight forward onto the block leg, often before the left foot has landed. This limits maximum use of leg power.
REMEMBER: You're more powerful on 2 legs then 1. Hold your weight back until left foot contact then EXPLODE!!!
7) Dropping the elbow when puting.
First off this is a throw, which is illegal. Second off this can lead to a arm injury and frequently does. Always stress "elbows up".
BEGINNERS
Flips - 2*3 each arm
Mashed potatoes - 12-20 total, mix and match for variety
Double pivot - 2 sets of 5, do 1 set without an implement
Step backs 2*5-10
Step-forwards 2*5-10
NOTE: The stand throw accounts for about 85% of a linear shout put throw. These must be mastered before moving on. A first year thrower could focus on stands, then walkbacks in their second year, then the glide in subsequent years.
ADVANCED
Flips - 3 each arm
Mashed potatoes - 10-12, with some of the explosive ones to finish
Stand throws - 10-12 (either step backs or step forwards)
Walkbacks - 5
Glide drills (done during walkbacks)
Glides 10-20