Empty H2 tag in Accordion paragraph

I recently performed an SEO analysis on the page https://epicure.club/spa/couples-massage-cape-town

The analysis brought up that we have an empty H2 tag. An examination of the page brought up that the content of the Accordion header, "Frequently Asked Questions", did not print on the page. Instead we only have an empty tag.

Without the SEO analysis, we would not have known that we have an empty tag, which mostly likely has a negative impact on SEO. We could add the desired H2 header "Frequently Asked Questions" in a prior blank paragraph, but this would not eliminate the empty H2 in the Accordion Section.

Am I overlooking something?