Time Machine- New Back up when connected wirelessly

I recently had my macbook worked on at the genius bar which fixed some software problem. The problem is that now when I try to back up my notebook through Time Machine to an external hard drive connected to an Airport Extreme, Time Machine starts backing up my entire hard drive not just updating the existing backup.
This doesn't happen when I connect my macbook to the external hard drive with the usb cable.
How do I fix it so that it only updates the existing back up files, instead of starting from the beginning??

cb2325 wrote:
Ok, but how come they used to merge? I initially backed up my macbook using the firewire port and then set TM to back up wirelessly and it worked.
There is an elaborate workaround to start a backup wirelessly, interrupt it and connect directly, get it to complete that way, then revert to wireless for subsequent backups, but otherwise a whole new "sequence" will be started.

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