Hi, friend.

First of all - it's not a bug, it's some of game features.

I don't think you will get any official information about "how many are there in my bg bank..." Only advises from other players.

In my opinion - you've got a piece of reward, not all. And next bg should give you the rest. But I'm the same player as you all and could be wrong.

Frankly speaking, I don't like bg - my internal hamster is crying on any lost unit...