Latest questions about "message status"

Hi, please let me understand what happens here: the message was sent to Viber account, but it did not show delivered or seen, but person has been on account several times since then - is it possible...

What does it mean when there's no "Delivered" or "Seen" status for a message, but the intended recipient/contact's status is "Online"?

If I uninstalled Viber and a contact sends me a message, where does that message go to?

Are messages always delivered in chronological order?. For example, I am sending one message at 10.00 pm and a second one at 10.01 pm to the same person.