Problems With A Table In A Publication

I have a database with two publications, one for SQL CE Clients with filters that send each client its data and keeps it database with "low weight" filtering data not older than a week, and the other publications for SQL Servers.
The publication for SQL CE Clients works excelent, the other one has this problem:

In the publisher i can insert data that should be replicated to subscribers, but subscribers don't receive it. And if I try to insert both in the publisher and the subscriber, the subscriber throws a Primari Key exception.
In the other way, if i insert the data in the subscriber, when it synchronizes, the publisher pulls this data to the table and keeps it, but deletes the subscriber table due to a "conflict". And it never sends the data back to the subscriber, keeping the subscriber's table always clear.

Any Idea?

Thank you.

Omar.Rojas