Forwarding to a POST Type content after registering to course

Hello, when my users register to a course, then it should redirect to the course content , but for some reason, it sometimes redirects to a standard Post (Blog Post) type page where it shows the lesson content without the other course materials.

for example this lesson’s course content should show via this link https://scout.am/courses/fs1/lessons/fs/ but it’s redirecting to this link https://scout.am/lessons/fs when clicking on register.

and this also happens when a students presses the finish this lesson, so it shows the next content of the course. and sometimes it shows error 404

but this is fixed when the user goes back and click the lessons content or continue course

The page I need help with: [log in to see the link]