1ml Carts equal to 20g?!

Just called up alternaleaf to find out why my prescription was delayed I had requested 40g and two vape cartridges (my usual) but was told this exceeded my 60g limit as it totaled 80g. Last month the carts were out of stock so I asked for 60g of flower at my consultation, this reset my allowance to 60 and caused my repeat this month to have a problem. Thankfully the lady on the phone has been lovely in getting it sorted but a word of warning to anyone thinking about swapping out flower for a cart.

Edit - changed farts to carts