There is nothing wrong with the order. There are four different four page variations on the same scene.
1-4 is text with shirt on. 5-8 is first person perspective with an alternate scenario. 9-12 is texteless with shirt on. 13-16 is textless with shirt off and hairy.
@LearnWithDoujin maybe edit the uploader comment with the variations listed by page number will help avoid further confusion.