Run should be just shift by default, or you can assign your own input. Spacebar/shift issue sounds like its possibly assigned to 2 strings.
Have you updated the layer and buttons on Opsive tools main manager settings? The other thing is to test in the demo scene to see if the same things happens there. Then test in a brand new project and compare input manager settings. One last thing to try is to switching to old input system settings which is what I use.
You can change and use the old or new input system, or both which is found in the input manager changing this to old system worked for me by going to;
Project settings
Player
Then look for configuration and there is an option to pick new old or both input systems.