More than one accordion shortcodes on a single page

I can’t get more than one accordion to work per page. One works fine, the other just displays all the accordion items as a big long list.

Even just using the default accordion content, the second one will not display as an accordion. If I try to use Visual Composer’s own accordion code, the other Ishyoboy accordion crashes completely, so I can’t see a way of displaying two accordions, unless they’re both NOT Ishyboy short codes.

I can’t see any reason for the conflict. Any ideas?