I used my laptop to remove two calendars and add one calendar to my Google Calendar account. After syncing, the Calendar app on my Android (2.2) phone knows that I deleted the two calendars, but does not know about the calendar that I added. Is this a common problem? How can I fix it?
Within the calendar app's menu, see if the newly added calendar shows up in My Calendars.
Select and sync your account.
If it doesn't or you have problems, clear the data cache from within Android's main settings > Applications section and resync.