I do not get a clear picture of what happened from your post.

Could you give more details of the following statements?

1. Any time, if I was interview by company B, the company A that was already in the interview process would stop the interview process immediately.

2. the interview schedule took more than 4 days until I pushed them with a few emails. The strange thing is that 3 confirmation email arrived almost the same time, around 9:00PM PDT. But the time on email were 10 hours early, around 4:00AM tommorow.

What do you mean by

a) "pushed them with a few emails"? How did you push them?

b) "the time on email were 10 hours early, around 4:00AM tommorow"? What date was "tomorrow"?

c) "stop the interview process immediately"? Did they send you emails or call you to cancel the scheduled interview?