The pattern should be from left to right like reading
drainer:
1,2,3,4,5
6,7,8,9,10
11, 12, 13, 14, 15
fish:
1,2,3,4,5,6,7,8,9,10,11, 12, 13, 14, 15
Are you sure you did it correctly?
Maybe try again... if there is still a problem then send me your saved game and I'll check... I hope it's not a bug...