This is not actually an issue. You are getting all the chips and EXP for winning a game, but please note, that if you have a large quantity of chips, they will be displayed like this: '42.6K' or '2.6M'. This way you won't notice small changes in the total amount of chips, but don't worry: if the game window says that you've earned chips after a win, it means that they were added to your total. The same also goes for EXP points.
If you wish to improve your experience with the app, you can bet higher to win more and actually see your chips count increasing. The bet slider is located at the top of the menu after you tap "Play online" or "Play for chips".