When you login to the ShareCenter web interface as administrator what does the 'Storage Status' on the right hand side of the screen say?
It should give something like Volume_1, then under that a bar giving visual representation of the amount of the drive used, then under that the drive capacity and amount available expressed as both numbers and a percentage.
It is no good trying to run a program that is designed to run in windows on a local machine and expect it to see linux formatted drives on the network.
The 1.92 TB is what I would expect from a 2 TB drive so other than checking if the drives you have are on the 'approved' or 'found to work' lists I would go through the RAID setup screens again using the web interface.
Edit: Just had a quick look at the disks list sticky at the top of the forum and your drives appear as being used in standard configuration by one person (last list on page 6).