How to display isometric maps with pytmx?

[Piethon]

Is it maybe this x, y, that needs converting "accordingly"? This means some sort of offset?

if tile:
    surface.blit(tile, (x * self.tmxdata.tilewidth,
                       y * self.tmxdata.tileheight))

Makes sense, but what do I need to change there then?
I just uploaded some photos of how it is looking and how it is supposed to look. Maybe you can see my problem then:



That is how it is supposed to look
Now how it looks like:



Thanks

PS: If you can't see the pictures, probably click onto the question markes or just on those links:
https://www.photobox.co.uk/my/photo/full...2676050483
https://www.photobox.co.uk/my/photo/full...2676048558