You can audition at any centre - it doesn't have to be the one you want to attend classes at - so I wouldn't read anything into that. Many people audition at a different centre if the audition date suits them better.
In terms of actually attending classes, sometimes people choose a further away centre if the day of the class suits them better (Sunday not Saturday for example) or because they'd rather do less or more sessions. Lots of variables and everyone has different schedules.