Many moons ago, the Dynamic Legend tables were in fact Dynamic. This is no longer the case.
When the surface is re-built, the analysis is run, but the tables do not update. In other words, the surface and surface display are correct but the table is not.
There are ways to make the table update, start the insert label process, once you select "type" dynamic, the table will update, even without inserting. The other way is to go into surface properties, and go to the analysis tab, close and the table will update.
This should either be fixed, or the name should be changed from "Dynamic" to "Updatable"
Thanks,