Some students have more assignments than teacher assigned

I created classes by connecting to my Google Classroom.  For the most part it worked flawlessly.  Most of the students were able to see the three assignments that I assigned for them to complete.  A handful actually had to use the class code to join the class.

However, I have a handful in each class that see more assignments than what I posted (Algebra 1 course).  Even though I only posted 3 assignments, these particular students are seeing 15 assignments that include videos but not the 3 original assignments I posted.