Just checking the situation.
Pictured is your new breaker is on the bottom right. Outputs to a separate box with a new outlet in your room. You did your switching inside the house between the old and new outlets without touching inside the breaker box?
I would try moving your new breaker to the slot just above it. Get on the other phase.
Being nosey. The 50 amp breakers goes to your Tesla charger?
I would like to see inside the main panel. Where we are getting the feeds from. Looks like they come in from the lower right. Hots goes to the 100 amp breaker top left two. The stranded aluminum cable going to the neutral buss, top right.
What I don't see is a neutral cable terminating On the neutral buss. No, zero wires on the ground buss. And more copper ground wires on the Neutral buss. Leads me to believe the that ground cable is carrying both ground and neutral. I would not sign off on this box.