Help Calendar on the Samsung Galaxy S2 Skyrocket

[sweetpea01_36]

Up until Dec. 23rd my calender on my phone and the one on my google account have had the same info but now the one on my phone has no events before 12/23/12 but the one on my google account has everything. This is the 2nd time this has happened and I can't figure out why. I have looked in the calendar settings to see if the is an automatic delete time frame but didn't see one. If anyone can help that would be awesome as I need the past events for my records. Thanks