According to the Competitive Fortnite Team have a message for the Fortnite Competitors,
There has been a recurring issue that causes a member of a squad to disconnect while loading into a match. When this happens, an error message will be displayed to your squad, giving you the option to continue the match or abandon it so that it does not count.
Upon clicking " continue match," teams can then play out the match but their points were not recorded nor added to the leaderboard.
Epic Games are beginning the process of manually correcting all points issues that occurred during the FNCS Weekly Finals (Round 3) of each region due to the issue.
As a result of our error, they will retroactively award updated prizes to the corrected top teams, but also will not remove prizing from any team who qualified under the incorrect results.
Repairing the scores may impact which teams advance to the FNCS Season Finals, and teams previously in qualification position may fall out of their previously held placement. Please refer to the updated leaderboards once they are posted to determine which teams have qualified for the FNCS Season FInals.
Epic is continuing to monitor the issue and are working toward a resolution. In the meantime, if you into the issue, please submit feedback via the in-game settings with the text "!missing squad"