Why are my kills, damage and accuracy blank?

Those statistics are reported by the game after a match is played, not calculated by the website. Until that data arrives the columns stay empty — so a match that has not been played, or whose report has not come through, shows nothing rather than zeroes.

Wins and losses can therefore appear before the detailed statistics do. If a played match is still blank much later, tell us the tournament and round and we can check what the game sent.