Label class number changed after export dataset

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  1. Project type (Object detection, Classification, Polygon, etc.)
    =Object detection

  2. The operating system & browser you are using and their versions
    = Colab

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    = When I upload darknet annotations with images in Roboflow project, export Yolov5 Pytorch format.
    When I see the annotations, class number is totally messed up. Why it happened?

My class is like this:

1~0 A~Z
The total number of classes is 37.

I am having the same issue. Ideally, label numbers should not change even if there are no labels objects with that class.