Sometimes I am first place, but suddenly then I become second placed, however I was far in front. How is the ranking displayed in case of a tie?
This can only happen if you are tied with another player. In case 2 or more players have the same stats, they will all be displayed as the same rank. If a player moves forward on the ranking, then they will be the top 1, and the other player(s) who were tied, will be top 2.