Block Entrance Animations

I am creating a course in Rise 360 and currently have 2 lessons under a heading. In both lessons, the structure is the same as follows...

  • Multimedia Block - Video
  • Multimedia Block - PDF
  • Text Block - Heading and text
  • Interactive Block - Flashcard Grid

Anyhow for some reason when I preview the course the Block Entrance Animations when scrolling doesn't work for the PDF & Flashcards in Lesson 1 but does in Lesson 2. 

What am I doing wrong? I have even tried publishing to review to see if it was a preview issue and it does it the same.

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