I'd give WireShark a go on your PC. Shut all background stuff down, get it running (so in theory you'll hopefully have 0 traffic coming up in WireShark), then browse on your phone and watch the traffic.
Could try rebooting in safe mode (with networking) so absolutely nothing is running.
I can't really think what it could be, unless your router is acting like a dumb switch and just sending all the traffic from your phone to every connected device?
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