Anyways, people. Followers are not paper dolls or puppets. They are (trying to be) people with their own will and equip whatever they think is better, not what you command them to. Aside from the currently bugged bow, their behavior is completely normal.
No, these followers are not trying to be anything. They are pack mules and meat shields. They are the bare minimum and are not exhibiting any type of personality traits when they do what they do.
@Andaius - In the meantime, until the CK comes out and there are better followers to use, if you go into the console and do showinventory you can then do removeitem for the hunting bow (you only need showinventory to get the ID of the hunting bow). I've had to remove as many as six out of Marcurio's inventory (that was done at one time; not on separate occasions), but once I've done it that way he will use whichever bow I give him without fail.