Problem 

There are lower impressions or clicks (stats) on the periodic parent campaigns compared to periodic child campaigns.

Explanation

• The product expects the periodic parent campaign metrics to be similar to the combined counts of all the periodic child campaigns. 
• However, the periodic parent campaign sometimes has a lower count due to the removal of existing variations.

Example

• For instance, when a campaign is set to send daily, and variations are added and removed on specific days, the periodic child campaigns created during those days will display the variations.
• However, the periodic parent campaign will not display or record stats for the variations that have been removed on those specific days.