Results for R18-Rd100?

[TzxzT]

Hello:
Thanks for your open-source implementation! I run your code without modification and find the results on 14 classes are same,except on the class "transistor" (R18-Rd100):
image ROCAUC: 0.887
pixel ROCAUC: 0.959
vs : (yours)
image ROCAUC: 0.925
pixel ROCAUC: 0.968
I'm confused because i don't find randomness and all other classes's results are same. Do you have any idea about this?
btw, the per-pixel level ROCAUC seems to be calculated on all images once. How about evalute on single picture and average the AUC? Which is more reasonable?