Hi Abdi,
If you haven't been in contact with one of the developers already, can I ask that you open a ticket and document the cases that don't work please*? (Even if you aren't sure whether its a bug or not, it would be good to get the info on possible anomalies!) I would really like to fix/see these issues resolved.
Cheers and thanks,
Simon
* - GeoNetwork opensource Developer website (osgeo login needed)