Welcome to the Wyze User Community Forum @tjbeads! 
Cams are triggered to upload to the server by any motion event within your FOV or DZ if on. The server then looks at every single individual frame, one still image at a time, 20fps day, 15fps night, looking for anything within the FOV or DZ if on that looks like one of the AI objects that you have designated. Because it is inspecting still frame images, the Server AI Engine does not see any motion. If there is any object in your FOV or DZ that looks like one of your designated AI Smart Detection objects, in any single still frame snapshot, it gets tagged. That is just the way it is. Whenever you have a Motion Activated Upload Event, it sees a Vehicle and it tags it. You have a couple options:
- Reduce the sensitivity to reduce the number of uploads
- Use the DZ to block out the Vehicle
- Move the cam position to not have the vehicle in frame
- Turn off Vehicle Detection
There is a Wishlist topic linked below asking Wyze to develop Moving Object Only AI Smart Detection. You can follow the link, vote for it, and add your post there.