I also see this score reduction for 40+ point words. (Just look at the monthly list of high-scoring words.) Typically, like you noticed, it's a loss of 2 points off the base score of 2 x (letters-1), although the special letters still seem to score pretty much normally. Of course they have a 45 point max. I felt cheated (or at least puzzled) the first time this happen to me.
I'm not sure if this kind of thing happens with long words not in the ultra-rare category. Then again, I'd think that "common" 23 letter words would be very rare.
By the way, congratulations on PSYCHONEUROIMMUNOLOGIES!
Last edited by Spike1007 : 12-12-2017 at 02:16 AM.