I checked both the taxonomy views and noticed that they were mostly set up correctly.
The only thing missing was the query filter in the parent view 'Resource Topics' so that it shows only the parent-level terms.
( i.e. Select taxonomy terms whose parent is None. screenshot: hidden link )
I've added that and the nested list is showing correctly now.
Tip: To include the empty terms in the view's output, you can uncheck the option 'Don't show empty terms' from the view's 'Query Options'.