This is the issue I noticed in IBM BPM 8.5.7 before december fix pack. This might be fixed in next fix packs, but if you are facing this issue you can try the steps in last paragraph. If you want you can read my sad efforts :D I had faced this issue while designing dashboard client side human service (CSHS). For testing the dashboard service with custom components, I copied it into toolkit and then forgot to remove it before creating toolkit snapshot. As a result, the process apps started showing this coach from toolkit under Exposed items after upgrading to latest toolkit version. It took some time to figure out why multiple dashboard is showing up in Process Portal and later realized the duplicate copies are from toolkit. So fixed the exposure of the dashboard CSHS (I didn't delete, as I needed it for testing) and upgaded the toolkit version. As expected it removed the coach from Exposed items list in Designer, but interestingly it was still available in the Process Portal a...
In this blog, I have accumulated the solutions to the issues and learning that I collect while working in IBM BPM. The product is improving every year version by version but still, it lacks many features that is expected to be done in the product. Hope you find solutions to some of your problems here.