check if you have anything suspicious on your website, for example using maldet to scan the related user home directory. Google doesnt show this warning without any reason, but personaly I never had or saw something hosted on a hestia server ever.
not a users website. the control panel flag as dangerous. i did scan the server maybe false positive. the site got flag and then i was able to get it removed by sending a review using google search console. no idea what may cause to flag the control panel as dangerous site.