Size of matrix exported from Comsol : understanding?

Deal all,

can you explain how to understand the size of stiffness matrix which is exported from comsol,

for example i have a 2d cantilever beam, discritized with nel_x x nel_y=20 x 10 => nnode_x x nnode_y = (20+1) x (10+1)=231 nodes, and ndofs=231 x 2=462 degree of freedoms,

so i expect the size of stiffness matrix will be K(full)=462x462, but the size exported from Comsol is: 1322x1322

you can following the matlab file for runing in Comsol server;