Can a H4 extension get approved before the H1B?

So we have applied for the H1B extension through my husband’s company ofcourse. Simultaneously, mine and our sons’s H4 extension also got applied. Everything went through in premium. Now, we have got the H4 extension approved till 2019.

My husband’s H1B extension case is still in “Received and Receipt Sent” status.

Is this possible? Does this mean H1 also is automatically approved?