Erasing current website when adding in custom theme

I’ve been trying to track this bug down. Do you have any description of what you did plus screenshots?

For instance what install or theme? Theoretically this shouldn’t happen because the plugin will not create anything that already exists and is restrivted to the themes directory in its operations, but I have a feeling that some hosting environments, installs, and or themeS violate coding standards and this is causing an issue.