Looking at this I'd have to say both Ana and Nancy are correct.
200 for the round + 196 for his score = 396
He didn't show his CC bonus but being in a level 19 club it would be 7%
396 x .07 = 27.72 drop the decimal for 27
396 for his base XP
792 = 396 x 2 for the promotion (it shows this on his screenshot)
423 = 396 + 27 for being a Premier Member (shown on his screenshot)
27 for his CC bonus (not shown)
396 + 792 + 423 + 27 = 1638 which is exactly what he got.
which in reality is 4 x XP + 2 x CC bonus
Premier members are not getting the 5x they expect because the base XP is only added once.
Hope that helps, Dharla