Many vendors on here are not just one person, but a multitude of people, if they were just one person they'd never be able to handle the amount of orders.
So give him/her (the gaffer) the benefit of the doubt. It could be that a new member of staff is playing silly buggers and pocketing decent weed whilst packaging guff fan leaves to make the weight up.
Get in touch with them and fingers crossed you'll get a conclusion you're happy with.
All the best.