Level 3 Sprint 1 - 8.3

I am unable to progress past section 8.3 in level 3 training. The notice says I need to complete the content above before progressing but all sections above are marked complete and 8.3 has no checkbox. I have opened the training on both Chrome and Edge with the same issue. Screenshot below, has anyone else encountered this? 








    When I moved the window from my laptop screen to a monitor the checkbox appears! Strange error as all prior sections worked fine. The two windows side by side is shown below in case anyone runs into a similar issue.