Tiled landscape x axis messed up


I have a problem: back in 4.7 I imported a built landscape from world machine and it worked perfectly. Recently, in 4.9.2, I deleted all sublevels and re-imported the landscape using same r16 files. It gave me this:


As you can see tiles are not in the right order in the x axis. Any idea why?

Thanks in adavnce,

I’m having the same problem, have you managed to figure out how to fix this?