I encountered the same problem. There seems to be an issue with the random tests where the last layers of a landscape have too few characters. The solution for those random tests ignore the coloumns with missing characters alltogether.
Example:
Input string:
"ABC\nDEF\nG"
The provided solution would be:
"A\nD\nG"

So maybe I am confusing two of the mayan calendars here but the two mayan date time converters that I found online BOTH stated that 1 January 2000 was in fact 12.19.6.15.2 on the mayan long count calendar. And I believe that they are right because it adds to the whole '2012 end of the world' theory because 13.0.0.0.0 would then fall on the 21 December 2012.
Otherwise great kata!