I'm still waiting 3 packages from 2 different orders, in both purchases the seller sent me 2 packages.

Obviously both packages from each order were sent at the same hour. But a package of one of the orders arrived a few days ago to USA, indeed tomorrow or the Wednesdey will be delivered. But the another package of the same order hasn't yet arrived to USA.

Also, both packages of the another order hasn't yet arrived to USA.

These are the tracking numbers:
LW039284643CN
2017-03-26 01:11 Hangzhou City, leave Hangzhou sent to Miami

LK195104108CN
2017-03-24 12:34 Guangzhou, left Guangzhou to New York's JFK Airport (transfer)

LK195186138CN
2017-03-24 12:34 Guangzhou, left Guangzhou to New York's JFK Airport (transfer)

I'm just wondering what's happening, because I'm very worried, so please, I hope that anyone can help me.

I think you mean that the packages will be delivered by end of April, right?

And I have another question, in another purchase, the seller sent me the package and gave me a tracking number, but not found any information of the package, and obviously I've claimed this problem.

I've asked him to resend the package, then I was expecting another tracking number, but the seller told me that he sent me the package again, but that the tracking number is the same, which will only be updated.

So this is possible or the seller is lying to me?

This is the tracking number:
LW070388539CN
Item is not found at this moment, If necessary, please verify with the package sender and check back later.

Possibly your seller is lying to you, because there is no mail associated with tracking number LW070388539CN. Might be a fake, but that also might mean that your seller is out of stock. He'll (hopefully) ship your package when he has restocked, and sends it to you with the same number, and this time, it's trackable.

Hope it helps