MarkVision Professional; The MVP server is storing the values received from the printer as unsigned values, even if the printer is sending signed values. The value should be -1 (4294967295) or -2 (4294967294).
MarkVision Professional 10.2 includes the fix for this issue. Please update your server to this new version.
Once the new version is installed, the values sent to the database will be signed values, which will be reported correctly.