Problems with tooltip customization after applying range slider

[jacekpietrzyk1]

Hello,
Here is my code: https://www.podzielsiehistoria.pl/Chart/ParishStatistics?parishId=1

Everything is ok, when there is no tooltip customization properties declared in the 'option' section. After the declaration of "mode: 'index' " a tooltip doesn't work. The same issue is with every other declaration of the tooltip property. Have somebody an idea what is going on?
The same issue is when you try to customize tooltip here: http://jsfiddle.net/schme16/xfyvvup8/

Another issue is a display problem on mobile devices. Loaded chart is not displayed. When you tap on the screen everything starts to be displayed properly. It must be some kind of refreshing problem.

Will be gratefull for your help,

Jacek