General practice, not a claim about any one account.
DifferenceOrder time versus payment time
A store can record a sale when the order is placed, when the payment clears, or when it ships. An ad platform records a purchase at the time of its own event. An order placed late on one day and paid the next can land in two different weeks. Pick one definition and use it in every report.
DifferenceRefunds and cancellations on a later day
A refund or cancellation usually lands on the day it happens, not on the day of the original order. A weekly report can show the sale in one week and the refund in another. Label each revenue figure as gross or net before you compare it with anything else.
DifferenceTime zone and currency of each source
The store, the ad accounts and the reporting tool can each use a different time zone and currency. A day cut at midnight in one zone is a different day in another. Converted amounts rarely match to the cent, so expect small gaps.