Well it looks to me like it starts on JobAcc2, then to JobAcc6, to JobAcc3 then to JobAcc7.
So the order in which you place the dropdowns is important
If you've used a table for the dropdowns, this is probably the issue. If you place the dropdowns into two div columns instead, then this issue should go away.
I had the row conditionals wrong 5 and 10 instead of 4 and 9! Mind this is a fudge - I don't like it as it's not clean.
OK, conditionals taken out by the introduction of parent index for the dropdowns class. Also included space for questions in the answers table, so that it can be 'usable'. SO it should be 'clean' now - no manual fiddling with the js if you need to add another bank of questions.