The S-AFC is set up to accept the lowest reading as 0% throttle. The TMO and Pocketlogger read the throttle setting from the ECU, which knows better. In other words, the S-AFC is wrong. However, this discrepancy does not affect the S-AFC operation in any way, so don't worry about it.
AFC owners should check out the Super-AFC-DSM mailing list on Yahoo! Groups. You need a Yahoo! ID since membership is now restricted. To join, click here.