Multiple servers were not showing up on the primary and US metaserver lists because their summary info in certain fields exceeded the character limit off what was allowed by the metaserver database code.
The metaserver code base would simply drop the servers from the metaserver list when this was encountered.
NOTE: the EU metaserver would still allow and display the servers because it's version of PHP did/does not enforce this character limit
commit [28c3d3]
Bug #945 Servers not showing up on the metaserver lists due to character length limits - increase character limit in archbase, mapbase, and codebase from 20 to 64, increase version character limit from 25 to 64
Related
Commit: [28c3d3]
Another issue that was preventing servers from being listed on the primary and US metaserver was the version field after the git migration. The version - # of commits - hash exceeded 20 characters.
Now the primary and US metaserver are both running the updated code and game servers are appearing now on both game server lists.