I'm with NoD, and from the "info" given so far, would lean toward it either being either
not enough loaded aft
too much loaded foward
a lot too much being loaded everywhere
stab set incorrectly
wrong thrust or speed or flaps
or a combination of the above.
All of the above can be affected by a large number of variables, which are completely out of the hands (and eyes) of the guys in the hot seat, so lets no jump on the bandwagon too quickly.
On another note, mention is made of TOGA being selected after Vr.
Can someone who knows tell me if you are likely to get a flex t/o out of JNB going home? And also, what variety of Bus is it?
Well done to the crew for the return.