No. You should only have lost 2 elements.
Only the "initially destroyed element" has a zone of death, i.e. the one at the front doing the fighting with its combat factor from the table at the top of page 36 (or if it was a rear attack, the one at the back doing the fighting).
"initially destroyed element" is mentioned three times in the paragraph at the top of the bullet list.
It has to be said, though, that "initially destroyed element" is never defined, so could easily be misinterpreted by an over-enthusiastic player.