I think the strange beast is even more awesome at alchemy than you realised or the delivery elf is at it. The 500 sprouts turned into 50 cabbages, but then somehow had become 100 cabbages in the portfolio.
“Upon arrival, the helper elf hands 500 sprouts to a strange beast who has the power of alchemy. One touch and 500 sprouts turn into 50 fresh cabbages. After a brief moment of wonder, the elf is off to deliver the cabbages back to Freetrade.”
“So it’s been problematic, but we’ve got there. The elf quickly updates your portfolio to reflect your new ownership of 100 cabbages and heads home for the evening.”
Did the elf cut them in two? Or was it a mixed batch of mummy and daddy cabbages?