CONF iture, I don't think the initial GPWS is a consequence of the Go Around, as we can read that the TOGA selection was a RESPONSE to the first GPWS warning at 1000ft.
So I would say first GPWS due to unstabilised approach and high (very) rate of descend (at least 2500 ft/min to get the Warning according to FCOM 1),
and then TOGA selection and mess up with the pitch and/or flaps/gear/crm...