I will make a note to add this to the documentation. Split-phase load centers have two 120V “legs”. They are the circuits created by each of the two mains and a neutral conductor. When a load is connected to both of the mains, it is 240V, when connected to one of the mains and the neutral, it is 120V.
The 120V legs are exactly opposite in phase. That is to say that when one leg is positive in voltage, the other is negative. So current in the two legs is opposite at any moment.
Your voltage reference transformer is 120V, and so is connected to one of those legs. It reflects the voltage in that leg but also the exact opposite voltage of the other leg. Here is a typical split-phase load center with no breakers installed:
You can see that the breakers alternate between L1 and L2 as you go down the rows. To complicate this slightly, your load center is mounted in an inverted position with the mains at the bottom. So what is normally the left main and called L1 on a panel with the mains at the top, is your right main at the bottom that you call L2, and visa-versa.
Starting at the bottom, the first row is your L2, then alternately L1 and L2 as you go up. Near the top, you have some double breakers that are both the same main corresponding to the full height row they are in.
In your panel, you have the CTs oriented one way on the left and the other way on the right. So you get that they must be different for each main, but not that they alternate in rows rather than side to side. In your box, the odd rows correspond to the right main that I believe you call L2, and the even go to the left main that you call L1. So going up from the bottom the rows are L2, L1, L2, L1… The Tesla CT is on an odd row, so is your right main, or L2. Since it’s reversed, we now know that odd rows should be oriented with the arrow (and wire) away from the circuit breaker. Likewise the three bottom CTs on the right are probably reversed and the top CT on the left is probably reversed as well.
For the 240V circuits, if the CT were on the other conductor (hence another row) it would be reversed by virtue of now being on the other main.
All of this is academic as the IoTaWatt automatically reverses in these situations and reports positive power. It only becomes important with the mains for net-metered solar.