Pandas value_counts on multiple columns : inconsistent result (bug ?)

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I have the following dataframe :

   df = pd.DataFrame( np.array([
       [ 1, -1, -1, -1, -1, -1,  1],
       [ 1,  1,  1, -1, -1, -1,  1],
       [ 1, -1, -1, -1


                      
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