there must be inconcistency between data. In some provinces they didn't harvested datas for busses like in some others.

While that might have been the national motto since italian unification, I think it's a problem of harvesting datas, for example I clearly see the bus lines in the Trentino province but in the Veneto region I can see them in the province of Verona and Venezia but in the other provinces just the railways. I guess because there is not a single central authority some do not publish datas online in the same way.