i had the same problem with products quantity, when i find out, that i change the option "
Share available quantities to sell:
" in multistore Defualt group options. i change it from No to yes.
after that i enabled Advanced stock management and i put the quantities in there.
on product page, under quantites i enabled the options that te product shoud look at advanced stock management for avalible quantity.
so, basicly you need stock mangement so the shops can be sinchoronized. the only problem is to do it manually for all products what you have and that's a problem when you have, example: 2000 products.
so, my problem is how to transfer to stock management the exsisting quantities.