colspan ignored when replicant added?

System

Please see the attachment.

When I create a DCR with one instance of a replicant it looks fine. But when I add a second instance of the replicant, all of the fields that should be affected by colspan get pushed outside of the replicant column. When I save the DCR and reopen it, the fields line up correctly. Is this a bug? Does anyone have a workaround?

Is there any way to get that replicant header (session-x in my document) to expand to the width of the entire replicant?