OK now I understand. But that's really not East or West, because East has no reason to be on the right, unless one turns the top of the page to the North. East is on the right only if Sun is there behind your back at noon (and this if you happen to be in the northern hemisphere). 
I think there is no significance, and the difference from the Latin alphabet may be well explained by the assumption that, unlike the former, where the shape of the characters has been defined by a historic process of development of writing, Voynichese glyphs are artificially designed, probably by a single person, with the sole purpose of encryption of plain text. As it has been quite thoroughly discussed by now, most conventional Voynich characters can be decomposed into the "base shape+tail modifier" scheme. Now, since the writing goes from left to right (and not vice versa), the base shape is to the left, and the modifier is on the right, which, given the shape of modifiers, pre-determines the direction of pointing.
I think there is no significance, and the difference from the Latin alphabet may be well explained by the assumption that, unlike the former, where the shape of the characters has been defined by a historic process of development of writing, Voynichese glyphs are artificially designed, probably by a single person, with the sole purpose of encryption of plain text. As it has been quite thoroughly discussed by now, most conventional Voynich characters can be decomposed into the "base shape+tail modifier" scheme. Now, since the writing goes from left to right (and not vice versa), the base shape is to the left, and the modifier is on the right, which, given the shape of modifiers, pre-determines the direction of pointing.