This still seems to be an issue on mobile/tablet view:
Screenshot: http://take.ms/dt2Ct
My workaround is similar to @planktonwebdesign, adding the following to an admin CSS file:
@media screen and (max-width: 782px) {
ul.acf-radio-list li input,
ul.acf-checkbox-list li input { width: 25px !important; }
}
Thanks!