Is this a Bug?

[Tsavong]

Has anyone else seen this?

Yes I've seen them.

That symbol floating above and to the right of the building.

That was in Empire you only would see it in campaign battles it means you can put a unit of men in the building.

The STAR in the right of the picture just in off the edge. Saw this happen a few times during battle. Just floated quickly up into the sky and vanish.

The Star seems to do this when a unit is effected by a Generals abilities rally or inspire.

The chevrons, to the left of picture. Again similar to the stars. during battle they also floated quickly up into the sky and vanished.
Noticed a single chevron doing the same.

I think but I'm not so sure that these is the unit getting experience.

I could be wrong but that seemed to me to be what was going on when I've seen them.

Hope that helps some.