Disclaimer: Just throwing ideas into the mix in case one of them sparks a solution; when a better answer is posted, go with that instead ;-)
There are other labels on the screen where it looks like the right-set alignment is working - what happens if you make a copy of one of those, and paste the text from the not-working label into it? Or select the entire array and make sure that it is all formatted as the tight-to-left font. Or maybe it depends on which is done first: the align-to-right, or the using a right-to-left font.
Also, the right edge of the label above the Facebook/Twitter/??? icons doesn't look very straight - it's almost like it's been aligned by adding spaces at the (left side) start of the lines. That might be a clue that the alignment hasn't worked previously, and isn't a new problem with a new update or something.