in test1 picture, there is a Windows Explorer. This interface is not aware of MSDP deduplication behind CIFS.
in the test2 picture, Quota Used column is referred. Quotas are calculated for front end capacity, not back end capacity: https://www.veritas.com/support/en_US/doc/150157642-154787255-0/v141680925-154787255
I am not sure if there is an option to check your query in other way, maybe only in the case you have just CIFS ingested data of a known volume on the MSDP, then check MSDP capacity directly by appliance/media server OS tools.