skulls, i did not receive them

i took on one players castle in war games 3 times in a row for about 600 skulls each but did not receive 1800 skulls, is this normal or am i being cheated?

If you attack the same person thrice, you’ll only get the max skulls the first time.

I suggest you to read more info about how war works in the Wiki page: http://royal-revolt-2.wikia.com/wiki/Alliance_Wars