Events multiplying

I am using an 3.2.6 on a Mac with a Treo 650. I use the iSync and LifeBalance conduits.

I have a a number of calender scheduled weekly event in LB. These events show up in my calendar fine the first time, but every time I sync, a new copy shows up. I now have 5 of them and growing. How can I prevent these duplicates from appearing? This seems to happen for all calendar events.

Thanks.