among all the returns in 1 year, it had never happened before. Try viewing with a different browser than the one you normally use. I don't understand why this bug happens. It's probably related to your personal set. But what exactly, I wouldn't tell you.
However, I just noticed a translation error in my message. I didn't mean "I wouldn't tell you" but "I can not tell you" in the sense that I don't know where the problem can come from but that I would very much like to know and help you.
(sorry I come from the least good country in English in all of Europe... France XD)