Let's get down to business. Facebook has already implemented the reduction of the attribution window, eliminating the 28-day ones. You can see the change at the ad set level, at the bottom, where it will now default to "7-day click or 1-day view":
In general, 2 types of problems are being encountered. Attached is an image of the areas of the Ad Manager that is affected so you know what we are referring to.
Problem #1
The columns of old campaigns are not reflecting correct data.
Source: Facebook bug
Solution: we have seen that activating and deactivating affected campaigns leaving several seconds of margin solves the problem in many cases.
Problem #2
The lower totals column is not adding up the values of the campaign columns.
Source: Facebook cannot show sums of campaign data with different attribution windows (28 days vs 7 days).
Solution: filter and separate campaigns according to their attribution windows so that only campaigns of the same type of attribution window...
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