Usually when this occurs, you will find a unit running in place somewhere. Click this unit and give new move orders, and this should clear up the problem. Needs to be fixed before release.
Yes indeed there was a unit running in place. I didn't think it was the problem. Thank you! Still needs to be fixed.
It can also happen if you have an idle city.
I had multiple idle citites but this was going on for a few turns already. Late game there will always be idle cities since you don't have anything interesting to build, and since they grow or double research or income on idle. I think the whole building system needs some balance and also buildings need to be more interesting and exciting to build.
