@panor The x, y value is the point with pixel in Tiled editor with the ortho map, and the x value is upside-down. For iso map, Tiled do some rotation for it.
In our engine, we convert the x, y value to our engine coordinate system, but for the ortho map, we don't do the rotation calculate, because it's not a square, we can't represent it use the 'x', 'y', 'width' and 'height' value. you can convert it by yourself.
We will use another representation for these value later.