@MPC- I think you have the same problem stated for the debug line:
" Extra Sphere collision is shown when using debug shapes including the debug line for the widget interaction component. This is an issue currently related to the 4.16.1 version. By disabling Instanced Stereo the bug goes away. This has been logged as UE-44947 at Unreal Engine Issues and Bug Tracker (UE-44947) ."*
Try turning off instanced stereo. If it resolves the problem, welcome in the boat waiting for UE-44947! Problem specific to 4.16