I had the same thought about this, but even if the girls did start the second routine before the performance last night that would certainly have put so much pressure on them, remembering which steps belong to which routine! At least the boys will have had only the one routine to practice for 2 weeks, unlike the girls, which I think does give them a distinct advantage for next week.
Plus the girls never got to perform their routines in front of a live audience at the dress rehearsal like the boys did which would have boosted their confidence more (or less if they fell lol) for the televised show last night ... is this series geared towards getting a male winner this year (ie DOI1 Gaynor - female, DOI2 Kyran - male, DOI3 Suzanne - female, DOI4 ... male?)