Why do the 'Sent' push notification numbers look different in the Journey statistics, the Push Notification dashboard, and the Detailed Statistics?

The 'Sent' figure is measured at different points of the pipeline in different screens, so small differences between them are expected. Here is what each place counts.

• Message statistics > Performance tab (Campaigns > One-time messages, then open the message) — SENT is the total number of notifications Pushwoosh handed to the push gateways (APNs, FCM, and so on) for all targeted platforms. The same tab shows DELIVERED UNIQUE, OPENED and ERRORS, with a per-platform breakdown.
• Journey canvas / per-element statistics — open the journey, toggle Show Metrics at the bottom of the canvas, then double-click the message element and expand the Drop-off block. Here the number reflects successfully processed sends for that step: messages that could not be sent (for example an expired push token or an invalid email address) are counted as Drop-offs instead. That is why a journey step can show fewer sends than the message-level SENT.
• Recipients — a subset of Sent that excludes devices which opted out of push (the Push alerts enabled tag set to 0). If a screen shows Recipients, expect it to be lower than Sent.

In short: message statistics report the send attempts made to the gateways, while journey statistics report the attempts minus known invalid or skipped devices. To reconcile a specific campaign, compare the ERRORS breakdown in the Performance tab with the Drop-offs shown on the journey step.