I am getting these warnings also from time to time on sites build by foundry or bootstrap.
IMO, this has has nothing to do with Foundry or Foundation. I had this messages on sites built with Foundry and on a template based site as well. I did two sites with the same template. One got errors from Google, the other was fine. Beats me.
Yeah, I donāt think itās to do with Foundry or Foundation, I think itās just down to the way the sites are built. Google just seems to be a bit iffy on reliably picking up these issues. Sometimes it does, sometimes it doesnāt.
Once Iād fixed what google wanted me to, it gave a better score.