Rank1 is low

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I use Market1501 to run the code. I set 300 epoches and the model can be trained. However, the rank1 score is rather low. The evaluation results are like this:
reid_baseline.inference INFO: Validation Results
reid_baseline.inference INFO: mAP: 55.4%
reid_baseline.inference INFO: CMC curve, Rank-1 :2.1%
reid_baseline.inference INFO: CMC curve, Rank-5 :92.5%
reid_baseline.inference INFO: CMC curve, Rank-10 :97.6%
The code seems fine. I can't find where the problem is.