It is including mrb_section.html, but it should include managed_mrb_section.html as managed_builds.html does. Otherwise the 'Latest builds' section lists different builds in the All builds and All projects pages, which is quite confusing.
This seems to be fixed on master:4bd886fb0081954879aaa2f574f3c7f6ced745d5
Verified on master: 8b3d3e7c957ad06c390886487f69aeb8e145da6a