Topic: Poecile inconsistency
Just noticed this problem, Chris.
G5 shows Willow Tit Poecile montanUS (Conrad von Baldenstein, 1827), NHMSYS0001688302, and does not have montanA as a synonym.
R6 has P. montanA with a pseudotaxonomic 'aggregate', and two subspecies; and P. montanUS as a ssp. only in two lists.
EOL at http://eol.org/pages/284208/names/synonyms has both as valid names, and both as preferred names in different systems.
I don't know what the solution is, but I expect you will work it out!
Murdo