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The inserters are taking items out of a train that is not present. There have been coal trains there in the past but there isn't anything there now - I have removed the track piece next to it and the inserters stop moving. I have been unable to reproduce this. This is a complete mystery to me - I hope this is useful!
I am running Factorio 0.14.3 on Ubuntu 16.04 - I doubt this problem is system related but I can give my specifications if you require them.
The inserters are taking from the wagon on the top.
Thanks for the report. The save made it easy to debug.
Fixed in Version: 0.14.5. If it still happens let me know.