The strange feedback of a submission made in Codeforces Round #418 (Div.2)

Правка en3, от Marco_L_T, 2017-06-07 18:50:43

Reyna's submission of Problem A in today's contest got Wrong Answer verdict.As Reyna is very good at coding,I felt a little strange.However,when I looked at the detailed feedback,it showed that it couldn't find a file,which I never saw before.More strangely,I re-submitted Reyna's code and then got AC verdict.Submission So,could anyone tell me what the reason was or it was a bug in Codeforces? Thanks!

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  Rev. Язык Кто Когда Δ Комментарий
en6 Английский Marco_L_T 2017-06-08 03:24:50 32 Tiny change: 's? Thanks!' -> 's? Thanks!\n\nUPD: The issue is fixed now.'
en5 Английский Marco_L_T 2017-06-07 18:51:29 4 Tiny change: 'C verdict.[Submissio' -> 'C verdict.\n\n[Submissio'
en4 Английский Marco_L_T 2017-06-07 18:51:16 2 Tiny change: '652681) \nSo,could' -> '652681) \n\nSo,could'
en3 Английский Marco_L_T 2017-06-07 18:50:43 70
en2 Английский Marco_L_T 2017-06-07 18:49:23 83
en1 Английский Marco_L_T 2017-06-07 18:48:01 544 Initial revision (published)