In the past sometimes my reviews would start one or two minutes after the hour. But now, sometimes it is taking longer, 8 or 9 minutes. It says the review is available now but in the review panel, no items are listed. Has anything changed or maybe an extension is messing up with the reviews?
I’ve never had a review appear at a time in between exact hours since they changed to the current system.
Are you using the website, or an app? Scripts probably aren’t the problem. Might be good to confirm that your PC or device’s clock is right. If all else fails, try clearing cache and refresh. If still no luck, it’s probably a temporary Wanikani issue.