You are not the person who is wrong, April 24th was the original date for the Petitioners reply. Through a joint motion, it has been agreed upon to move this date to May 17th... Below is the original scheduling order, I have included in bolded red the new dates...I would also anticipate that they will move the DUE DATE 3 once 2 is completed. I hope this clears things up!
DUE DATE 1 ..................................................................... February 10, 2017
Patent owner’s response to the petition
Patent owner’s motion to amend the patent
DUE DATE 2 ........................................................................... April 24, 2017 May 17, 2017
Petitioner’s reply to patent owner’s response to petition
Petitioner’s opposition to motion to amend
DUE DATE 3 ............................................................................ May 22, 2017
Patent owner’s reply to petitioner’s opposition to motion to amend
DUE DATE 4 ............................................................................ June 12, 2017 June 14, 2017
Motion for observation regarding cross-examination of reply witness
Motion to exclude evidence
Request for oral argument
DUE DATE 5 ............................................................................ June 26, 2017
Response to observation
Opposition to motion to exclude
DUE DATE 6 ............................................................................... July 3, 2017
Reply to opposition to motion to exclude
DUE DATE 7 ............................................................................. July 20, 2017
Oral argument (if requested)