Not a game breaker, just a graphics bug.
In game 20289: I have three sea serpents stacked East of ruin "Tower of Ashes" (South-East of the East island), two of which are not displayed in their water status (but in their "land/city status"). The third one is displayed correctly. But "the two" and "the third" were not together, I moved "the two" to the spot of "the third". "The two" were already displayed incorrectly on their starting spot. On this square I had a battle of three serpents of mine vs one of yellow, both losing one. (Turn 56)
Hope it's not too confusing...