Probably they only sent once and re-used the same number for several customers, easy to detect.
When you're really screwed up is when your packet arrives with wrong contents or is delivered somewhere else.
Happened twice already, I got some random contents (Pokemon cards, fake tatoos, cheap jewerelly, did I become 13 again? Crap, nope!).
Tge envelopes are usually relabeled after customs, and I noticed there was a different address in the old sticker, yet It took several messages and a lot of arguing.
The next time it was harder, the old stickers had been removed, leaving only a partial phone number and a ZIP code, and a large "Returned" red stamp.
That one took almost two weeks! The sellers said they didn't use that packaging, so there must had been other mistake in the chain.
After a lot of trumouble, sellers panicking sending me messages to cancel the case, I finally got everything back.
Althought I think AliExpress made them pay for it anyways, seems a platform that threat sellers like slaves, even if it's their fault!
Otherwise, else than skyrocketing prices, useless search engine (Will show what it wants you to view) and lots of crappy products, it's pretty good.