If your play count is not showing properly on the leaderboard, open the Profile tab, then tap on the Map that shows the courses you've played.

Opening that page will trigger the count to be manually recalculated, and will then upload the new count to your account and make it show on leaderboards.

If a round isn't showing up on the leaderboard, open the More tab, then select Privacy Settings and make sure that the Private Account option is disabled. Private Accounts do not show up on leaderboards.