[esp-r] building a 6zone structure

[Michael Dan B. Usman]

hello everybody,
i am currently having problems in building 6zones for my study.  i have no problems with the first zone since it does not have to copy any of its surfaces from other zones. the problem starts every time i copy surfaces from other zones. whenever i build the zones, i encounter a problem in the naming of the surfaces. it seems to be a hexadecimal symbol that takes the place of the surface name. when i delete that surface, all the other surfaces shift names and the hexadecimal symbol is still there. i end up deleting all the surfaces or doing the whole building all over since when i delete surfaces, other zones are affected.

what could be the problem? 
thanks!