afterthought:

if the VWD simulation 'free nail at end' checkbox at the bottom is NOT checked, the dragged vertices will stick when you let them go with the mouse (after dragging them). With a lot of finesse and patience I have been able to find and click again on the small 'sticky' dots and 'free' or unstick these points, but it is a touchy effort for me.

Maybe this is it - perhaps that checkbox is unset and VWD is automatically remembering it through your sessions.

VWD3D/dan

--
Resources: https://www.virtualworlddynamics.net - https://www.patreon.com/VWD
Rendo PM: VWD3D or VirtualWorldDynamics or support@virtualworlddynamics.net
Current VWD Version:   Release: V2.2.924.6464 - 2019/12/12, 9:46am
Qualifier: Yes, I'm helping Gérald with VWD, Nooo, I'm not yet an expert on its use!