You're testing two bad clones, and the results of the two tests should be consistent, but you're using a good cloned image when presenting the test data, which can be misleading.The group has already discussed the role of shielding.
/g/nanovna-users/topic/the_benefits_of_screening/33021262?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,20,33021262
Their difference is not only shielding, but the good isolation of the T/R port can effectively improve the measurement accuracy of the VNA.
