I solved the issue, the problem was after extracting zip I get 3 folders train,test,valid and 2 extra txt files i.e readme.txt and requirements.txt.
when uploading whole folder after extracting to my project extra classes were added by txt files.
I removed them and the classes were accurate but still incremented. i.e on 0 digit like above picture showed 1 for some reason.
I open annotation coco json files of train,test and valid and start changing with classes by moving it one place or adding one new class. After trail and error i fixed it. I had to manually update and check the annotation class to finally see the results.