I fixed it and it was again the same problem from the last post!
Delete the "World" folder and open the Forge-1.16.4-35.1.37.jar file to create the Modded world.
Do Not click the Minecraft_server.1.16.4.jar
Clicking that will create a vanilla server.
If you did make sure to delete the world folder and click the forge one instead.
Hope this helps anyone with this problem