1c data exchange with the website. Can you help?

Question

1C

I'm trying to set up data exchange 1c and opencart 2.0. But the problems are already at the stage of unloading from 1s. The module seems to work fine if you do not unload zero balances. The problem with 1s ... even if I upload locally to the catalog, it does not upload to me not everything that is available, but a small part of the goods. For example, in one folder there are 40 holes (with balances of 1 or more), and 7 are included in the unloading. The remainder field is filled in as "more than 0". Also, the balance of warehouses is not summed up. The field "remains by warehouses" is filled in as "in the group from the list - warehouse1; warehouse2; warehouse3"
I forgot to mention. I use the built-in 1C tool "data exchange with a website", which is on CML2 for Bitrix)