Tiles broken while zooming

I have created map tiles from “MapTiler-Tile Generator for Map Mashups”
and saved into a folder name as tile. This folder has tiles in x y z format upto 14 levels. I am trying to import these tiles into Cesium 3D globe but on that globe 3 India maps are coming at different places from
N pole to S pole and map is divided into 2 parts horizontally. While zooming any one of map among three then tiles are coming as in x y z format. But my issue is that why is the map divided into two parts?

Please find images as attached herewith showing my issue.