It flipped the y-offset for some reason:
ltr: text-shadow: #333333 0px -1px 1px, #FFFFFF 0px 2px 1px;
rtl: text-shadow: #333333 0px 1px 1px, #FFFFFF 0px 2px 1px;
That was weird. Now of course in that case it needn't flip at all and I can just tell it not to, but this still ain't proper behaviour.