Only the group start with an underscore and other items (in the same group) are corectly persisted. I did discover some warnings about the same node/channel: OH2 Z-Wave refactoring and testing... and SECURITY - #3277 by lsiepel
Well not sure if it is related because the basicUI gets updated and so should the database. I will set de debugging today.
openhab restarted and all trouble seem to have gone. Weird. Thanks for everyones time.