My last submission have been queueing for at least twenty minutes.

By the way, it seems like the judging system had crashed for a while at around 18:50 UTC+8. I took a capture at the fifth page of the status at that time.

There is a huge number of "In queue"s at the top but there are no "Running"s below. It returned to normal ten minutes after, and now it's queueing again.