There is a display bug when some x element can be casted as int:

import plotly.figure_factory as ff ff.create_annotated_heatmap(np.random.rand(3,3), x=['2019', '2020', 'total'], y=[1,2,3])

works fine adding a underscore
ff.create_annotated_heatmap(np.random.rand(3,3), x=['2019_', '2020_', 'total'], y=[1,2,3])