What does the X mean?

I am in a Fantasy LCS group with my friends and we have been doing it for awhile now. There are a lot of changes this time around and I can't find out what the "X" means in place of the W or L for win/lose. I looked at the standings and those teams played with the correct roster, so why wouldn't the game count towards my fantasy points? It's really annoying, there is one person in my fantasy league that doesn't have ANY points because all of her players/teams have an "X"

Any info on the "X' would be greatly appreciated :)