Hello @JaellaR ,
There are a myriad of things that could've happened to contacts that were in those lists. If any manual actions were taken within the past week, you'd be able to see that reflected in the Activities section of the Contacts tab. Contacts may have also unsubscribed, changed their listings through the Update Profile link found in your emails' footers, etc. It's also entirely possible the lists were set up for specific automated functions (e.g. sign up form submissions, automation triggers, click segmentation, etc.), and none performed the actions necessary to be placed in them.
William D
Community & Social Media Support
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