Advanced Accordion Accessibility Tabbing

We’re trying to convert a page that uses tabs and nested accordions. We started using this plugin as our previous solution doesn’t meet accessibility standards. In trying to set up accordions, it seems that using the keyboard to tab through the page content, it goes through the tabs as expected/needed. With accordion content, it seems to only keyboard tab to the first accordion item, but then skips to the next tab to page content (i.e. skipping the next accordion item).

Is there a setting I’m missing to ensure/force that keyboard tabbing occurs with the accordions?

Nester Accordion Example
https://code-work-lasalle.pantheonsite.io/llamas/biology-test/

Plain Accordion Example
https://code-work-lasalle.pantheonsite.io/llamas/biology-test-2/