Missing form and design elements in locat replica

Whenever I changed design in one database on a server, our users will miss one subform (and/or one form) in their local replicas even the missing design elements were not modified. The missing design elements would still be availble in the database on the server. They just cannot use their local replicas. The missing design elements just cannot be replicated to the locals. They need to replace design or create a new local replica to restore the missing elements. However, the same problem will happen again the next time the desing of the database is made.

Pleas help. Thank you. (We run compact and fix up every day, and I did not find any errors.)