I'm too lazy to write up a full explanation because I'm not nearly as interested in this stuff as I used to be (quite frankly, they're all there now, so what?) but here's what Livadia.org's Missing? site says about the issue:
If Marie is No. 5 and Tatiana is No. 6 ~ then the height for No. 6 is wrong.
If Tatiana is No. 5 and Maria is No. 6 ~ then the height for No. 6 is wrong.
If Tatiana is No. 5 and Anastasia is No. 6 ~ then the height for No. 6 is wrong.
If Anastasia is No. 5 and Tatiana is No. 6 ~ then both heights are wrong.
Is Maria is No. 5 and Anastasia is No. 6 ~ then the height for No. 6 is wrong.
If Anastasia is No. 5 and Maria is No. 6 ~ then both heights are wrong.
Where's a news outlet that says the height of the missing daughter that's now found? I had no clue that was "out" yet. (And it sucks, if it's Anastasia, then she was 3" taller than me. AAARG. And everyone goes on about how she was short...

)
I also think this is an issue of who's your "favorite". A lot of the people who love Anastasia will say, She was missing! Those who like Maria will be more likely to say, No, it was Maria Nikolaevna!
Again, all we know conclusively is that Olga was there. Now that the other skeleton (or bits of it? I don't know how much was there, etc) is there I hope we'll be able to figure it out. At least we won't have to deal with the Anna Anderson was Anastasia Nikolaevna! junk. Unless they say how the skeleton was planted or something by the evil Russians...