You're right, williamseal (assuming the typo in the across entry you mention).
In the downs there are 3 group As before the first group B down answer, which is immediately followed by the 2nd group B answer, then it's back to group A (the order isn't rigidly alternate - but within each group the clues are in order - all across answers first, followed by all down answers).
Ignore the numbered clue answers which are out of sequence.