Don't worry, you're not colourblind, its just the tint can be more difficult to see on top of certain colours, especially dark scenes because it doesn't affect blacks.
The balrog's flames are meant to be yellow right, not white, so you've got to take that into account. Only things that are meant to be white, like snow or the fade to white before frodo wakes up in rivendell, are going to look greenish with that strong green tint applied throughout the film.
Remove the green tint in this case and rather than the flames looking a sort of sickly greenish yellow you have in the fotr ee blu-ray screencap, they'll look a very cool flame yellow, like the Balrog deserves, being the badass he is.
Again in Rivendell, that scene doesn't look too bad because the tint is not that noticable, but keep in mind that Rivendell is supposed to look brownish/red, representing the autumn of the elves (i think i remember Peter Jackson saying something like that in the dvd extended edition extras) because their time on middle earth is nearly up, they're leaving to the undying lands. Does the fotr ee blu-ray screencap look reddish/brown to you? It doesn't really to me. You remove the green tint and suddenly it does.