invisible objects apearing in build but not in unity

In my groups game along a path there are two irregular shaped invisible colliders that only exist when the game is built. They aren’t in the scene at all and when played in unity we can walk easily through the paths.

Edit: We know it has something to do with the terrain.

Turns out there were trees painted in that randomly appeared for one of the group members so we just needed to remove the “paint” from the terrain.