Once your app reaches top positions, you will receive not only incentive installs you have ordered, but organic traffic too. You can check the number of organic installs in your developers' console on the market. It can be easily calculated with the formula total installs - ordered incentive installs = organic installs.
Different platforms have different formulas and methods to collect and calculate the data from the apps' promotions. Hence, use only 2 sources to check the results and compare the data. If you use our platform to promote the keywords, then use your developers' console to compare the results as it has the most accurate data.
Keep in mind that it may take 2-3 days for the installs to reflect in your developers' console and affect the rank.