This problem is caused by the addition of DebugExecBindings every time at startup, so the setting keeps increasing.
1. Enable RenderDoc from the plugin list.
2. When restarted, DebugExecBindings will be added to. "\Saved\Config\Windows\Input.ini" of Project.
3. DebugDoc's DebugExecBindings increases each time it starts.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-87322 in the post.