Calendar Problem

[rts#IM]

My iPhone calendar is erasing all data before the last 30 days or so, and I can't locate any setting commanding such. My computer calendar remains intact, but is not refreshing the deleted information.

Any knowledge on how to keep the sync intact, and not delete the data mentioned?

 

[shutter]

Settings>Mail, Contacts, Calendar
Scroll down to the calendar
Sync>Choose how far back you want it to go.

 

[rts#IM]

I appreciate your input but don't see how to sync it. At the Calendars Section, I only have 3 actions available: New Invitation Alerts, Time Zone Support, and Default Calendar.

How do get to a Sync option?