I would setup a CRON job to reset the database every day. This way you can reset the demo to something nice every day.
Another option is to store demo data in
$_SESSION. I do this with one of my scripts. People think they are messing around with the layout/colors/language/settings but really it’s only happening for them. So people could spend hours making my demo look ugly, without realising that it’s all in their local session. haha
It’s probably best to open a support ticket and then post the support ticket number here. The devs get assigned the support ticket so they can fix the issue and notify you when it’s resolved.
Here you go, just choose “Report something wrong with the site” from the menu half way down the page: https://support.market.envato.com/hc/en-us/requests/new?ticket_form_id=15700