Continue button

 Hello

Im hoping someone can help me.  Within my elearning for the first three sections when I click on the continue button it moves automatically onto the next section.  When I click on continue at the bottom of the fourth section it then stops and shows me the text Lesson 5 - Terminology (see attachment) and you have to click on this to move on why has it started doing this.  I have the block animations on so it works for some sections but not others.  There are no restrictions put on the continue button so this shouldn't effect it.