If its lost wax in the clay-wax-bronze statuette sense then I would guess at it being a few wax copies of the original being cast in order to add fine detail, perhaps because the wax takes those fine marks more readily, perhaps because those details are so fine they’d be lost through too many mould-making steps, or maybe several waxes are made so that there’s more than one shot at getting those details just so.
Edit – or if the mould is complete maybe wax positives are being cast to test the result before making final cast, as with many techniques you destroy the mould with the actual pour