We even once deleted some of our wins because there was argument about if those were actually wins or not, so we just deleted them.
It probably isn't 100% straight, maybe we have less losses
On the serious side, we tracked each win and loss, maybe all w/l haven't been added instantly but they were added. You can look at it like at statistical error possibility. There isn't any clan with 100% straight record, but this 1000 wins are positive.
TTYL (at about 2000).