Hi,
Everything there looks fine there, so I don’t think it’s anything strange going on with FactorySQL. Perhaps the easiest place to start would be for you to email a backup of your project, so that we can see how things are set up and what they should be doing.
You can simply copy the system_database file, or go to File>Backup>Backup system. Send that to the email Travis mentioned above.
Which OPC server are you using? If you restart the machine, does it work for a while and then stop, or does it always miss data? Is this something that just started recently?
Regards,