Duel Refresh is at certain time of day, much different from time of day that quests change.Normally several hours after midnight in US-eastern time. (Which corresponds roughly with time you made this post.So maybe you finished the original 5 duels, and then your time hit 4:00am US-EST, and they reset at that time, making it look like you have more than the first 5.
I did qualify that as “normally” 😀I used to know the exact time, either 2 am or 4 am (US-Eastern), so convert that into whatever other timezone people are in, but also depended maybe on Daylight Savings change.But (years ago) I did have at least 1 or 2 Ally friends whose time (for some strange, unknown, reason) always had their Duel Credit refresh time at some totally different time of day.So wasn’t always the same time for “everybody”.But if you saw it maybe refreshing twice, or at some other time that normal for you, maybe was indeed a glitch today.