Level 2, Sprint 3 - cannot complete INV01 Module Line Item Formula Details section

I am having an issue progressing from the "INV01 Module Line Item Formula Details" section in Sprint 3.


I cannot get this section to mark as complete, even after clicking all the blue ? icons to view the formula tips, including in the maximized view. There is also no manual checkbox to toggle completion. This means I cannot access the next section "Review the INV01 Line Item Formulas and Summary Method settings" to check my formulas since it requires this one to be complete first.


Any suggestions, or anyone else experiencing this issue?