In the histogram a gap appears between 2 bars.. anyone knows why?

I get this error:

The number of FixedLocator locations (11), usually from a call to set_ticks, does not match the number of ticklabels (10).

The csv file is just 2 columns, one with the name of the country and the other with the type of medal achieved, each line a medal with its type and country.

The link to the file is: