Why does the number of Served chats in Chat Analytics dashboard differ from Zendesk Explore?
Analytics doesn't include chats with the Chat completion value of Not Engaged in its charts. In Zendesk Explore, the Served chats metric includes them by default.
If you want to reproduce the Chat analytics reports in Explore, add the following filter to your report:
Excluded: Chat Completion is Not Engaged
For other discrepancies in Analytics, see this article: Why is there a discrepancy between accepted and served chats?