There are some nodes in events that are non-race nodes. Sometimes events will have branching paths where these non-race nodes can be.
Non race nodes, such as those in the below example, will count towards the overall percentage of the event so make sure you have passed through all of them.
Map: Episode 1, Part 1, Event 6
Map: Episode 1, Part 2, Event 4
Map: Episode 1, Part 2, Event 5
Map: Episode 1, Part 2, Event 6
Map: Episode 1, Part 3, Event 1