How can I get "Force HTTP on Front End" to work?

Hi there,

We're using the Domain Mapping plugin, and while the Force HTTPS on Admin/Login options work fine, the options for forcing HTTP on front end addresses isn't working—we aren't issuing SSL certificates to individual domains on this multisite installation., When I visit one of the mapped sites with "https," I get an "Untrusted Connection" browser warning, since the SSL certificate doesn't match. It seems to me "Force HTTP" would redirect a user to HTTP, but it's not happening.

Am I doing something wrong here? In short: trying to disable all HTTPS requests to mapped domains, but force HTTPS on the backend (the latter of which is working).

Thank you!