The eCPI (effective cost per install) you see might be larger than the target bid. After three days (or more), the eCPI will get closer to your tCPI (targeted cost per install) when delayed install postbacks are received from SKAdNetwork, and our algorithms have had time to optimize your campaign.
We recommend you wait at least three days from the last change for accurate comparisons between eCPIs and target bids before gradually adjusting your target bids.