Good to hear you figured it out 
As for your spawning event I’m a bit unsure how the level blueprint works with networking. I assume it might always be owner by the server. How are you accessing the PlayerStart for the client here? It might be an idea to time the spawning of the units so that it happens after the TurnManager has acknowledged that all the players have joined the map. Depending on how you’ve set up your code in the level blueprint it it might trigger before the needed clients have joined, returning false locations being interpreted as 0,0,0. Mostly guessing here.