Some questions about Omron PLC

After I exported Omron PLC tags using sysmacstudio, and then imported them as a txt into ignition, some tags were lost, and the missing tags were different each time I imported them. No formatting problems were found. Does anyone know why?

No, but that native Omron NJ driver is so lame that I wrote my own implementation as part of my EtherNet/IP suite:

No import/export required--I reverse engineered the NJ browse protocol.