personally I think the question is fine. if she is doing it intentionally it would be nice to know. I just think we have exhausted the knowledge of the people that have read this thread, and no one has the answer... so I would:
a) review many performances of ATM to see if there is a pattern of when she sais down down vs down town, like when she has changed lyrics when she is in SF only...
b) ask Vanessa at the next show and report back the findings.
just because people are of the opinion that it is incorrect and that saying down down isn't intentional doesn't mean it is fact, it is merely an opinion.
I am so glad you hear MAKING (all caps, thanks for that...). how many recordings have you listened to confirming you hear making every time?
-katia