One thing to note is that sender logs are stored in the browser. So if you're using multiple devices, the wallet logs for a send wallet will only correspond to sends on the device that conducted the send - ie it won't show on other devices. Satistics represent what the server knows about all devices. So that's at least one reason there might be a discrepancy.

Anyway, just wanted to provide a bit more info. We are currently doing an iteration on wallets and satistics so we appreciate the feedback!