ONLY use one of the "Fleet Formation Mods" at a time during a game session.

If you use mods that rescale ships (Such as Downscale Ships) or any Solar system scale mods, then you have to use the Fleet Formation mods specific to scale changes. The non-scaled mods will not function correctly with rescaled ships and solar systems.

Because of the scale changes the scaling mods are not interchangeable and you cannot swap them. Those mods are:

Fleet Formation Mod - Downscaled
Fleet Formation Mod - No Trails Downscaled
(These two mods are interchangeable with each other)

Fleet Formation Mod (Downscaled Ships & Solar System Scale)
Fleet Formation Mod (For Solar System Scale Changes)
(These two mods are NOT interchangeable with each other)

Fleet Formation Mod for Real Space - Ships in Scaling
Fleet Formation Mod for Real Space - Ships in Scaling-No Trails
(These two mods are interchangeable with each other)