There are several possibilities:

1. You have reached the daily limit of 50 iCoins that can be earned in GameWay. Check your transaction history in Account. Each day among all iCoins you earned in GameWay only 50 iCoins will be added to your total.

2. To earn 3 iCoins for each regualr game you play, you need to click the red button "Earn iCoins by Playing this Game" on the top right of each game.

3. You need to refresh the page to see the change of iCoin number on the top.