Apparently my feedback, or rep, or something is too low to have more than 2 active giveaways at one time.
You have 5 giveaways marked as received. That means you can have 1 (or 2, depending on rounding) as open/not received. Add 3 to that number and it means you can have 4 giveaways active, minus 1 for the deleted (it still eats a slot).
So, 2 open, one pending and 1 deleted means all is fine. Once HiB 3 is marked as received, you can make one (or two) additional giveaways.