During data checking, you may see a difference between "Ad Network Installs" and "Attributed Installs" for Tiktok ad network. Do note that only install conversions from Tiktok campaigns are tracked as "Attributed Installs" on Cost Center.

To improve on the accuracy of the metrics, you will need to update the campaign's objective as "App Install". Once this is done, monitor the installs metrics for the next couple of days to ensure that the data stabilises.