Global Triumph

1) The Daily Cycle doesn't commence until after you posted this.

2) It's possible that some of your units were told to move into the path of a second one of your units.

1) Yes, but I was concerned about the moves from 24 hours prior.

2) Do crossing paths matter? In the past I have observed that all was OK so long as the final location was not a collision.

Ive seen some of my allies have units cross paths and all go well. However, when my units try to cross paths, heaven forbid they let my units cross xD

Don't cross the streams....

Crossing paths is okay as long as unit doesn't stop in the path of another.  The units attacks matter in the order placed.  General rule start with the furthest moving units and work backwards through your group.

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if the star is a final spot of a unit the was told to attack before the one moving the second one wont pass it and you will end up with a 2 unit pile up

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Hope that helped and not confused the situation more.

Just remember two facts.  One, attacks are processed in the order in which they're set.  Two, a unit cannot pass through another unit.

So, if you set a unit in the rear to attack over another one of your units, it will stop when it reaches it.  Instead, set the front unit(s) first, then move back to the rear.

That is it. You'd think after playing this solidly for 2 months on 3 worlds I would have noticed already.