A proper wikitable ends with the contents of the last cell, followed by |}. If you instead end with the contents of the last cell, followed by a stray 'new row' like this:
- |
} |
then the result is two tables, including one that contains only a chess pawn.
Version: unspecified
Severity: normal
URL: http://en.wikipedia.org/w/index.php?title=Leukemia&diff=565207025&oldid=565205598