Hi @Albert1 - welcome to the community!
Most likely, if you were sending to a large segment of your list, it took some time for each email to go out to all of the recipients. When you select “send instantly” - that starts the sending process at the time you click that button.
When you check on the campaign now, it should say sending is complete. Do you see that in your reporting now?
If you don’t, then there may be something else happening in your account… but that’s unlikely.
Warmly,
Gabrielle
Klaviyo Champion & Marketing Lead at ebusiness pros
Klaviyo Champion + ATX Klaviyo Meetup host | Client Strategy Director at ebusiness pros - a lifecycle marketing agency based in Austin