The website for a company I'm thinking of signing up with has a bug regarding a collapsible list (https://www.servermule.com.au/vps-hosting/linux/). The FAQ at the end of the front page has one question with a visible answer and the rest with hidden answers - and you can't toggle back and forth between the two options by clicking on the title. I have brought up the html code in the developer tool that comes with Chrome and the relevant difference seems to be that the first question is set at 'collapse in' and the rest are set at 'collapse out'.
I have not coded html before but since the Chrome tool doesn't allow copy and paste I've tried to replicate the issue with simple html code snippets from various tutorial websites. None of them replicated the issue. Obviously I need to learn html, but for now what would be a simple code example to replicate this issue and correct it?