If a longer inseam (and hence saddle height) are accurately known, then the stack height should be proportional to that saddle height, to produce a given saddle to bar drop. The OP claims to have a cycling inseam that's only 6cm longer than mine, so the other 21cm must be torso length. A large frame size, might fit his torso reasonably well, but it sure wouldn't go with those short legs.

The geometry chart that I found also listed a much taller stack than the OP listed, so a comparison of the head tube length should be made to see it the OP's bike is really a 61. A stack of 630mm shouldn't be needed. That's over 10cm more than I need.