a cube meshed in 5x5x5 produce 137 vertices instead of 125
I used transfinite lines, surfaces, volumes to get hexahedral mesh.
Mesh.Algorithm = 8;//delquad Mesh.Algorithm3D=6;//Frontal Hex
Results look ok in GMSH (64 Hexahedra, 0 Prisms, 0 Pyramids), but number of nodes is wrong, namely 137 instead of 125.
Interestingly enough, this problem does not occur in 2x2x2 case. .geo script is attached.
Gmsh version is 2.8.4. Behaviour is the same for OSX and Linux.