Both mods fiddle with intersection so it's possible it's because of that. But I don't think TM observes the Lights on it's own. Try TTL without TM. Do the lights still revert back to their original state?


There was an issue with 81 tiles mod, that caused all lights outside of the default 3x3 area to revert, but that should be fixed now. But maybe you have another clone of 81 tiles mod or some other mod that observed the lights?
From the comments:

I inspected the issue some time and: The lights get loaded correctly by TTL -- but they get overwritten by 81 tiles mod. The same happens if you toggle traffic lights via Traffic Manager (I used Traffic Manager + Improved AI ).
So it's an issue with 81 tiles mod and not TTL (or any other mod that allows changing the lights)

As a side note: the newest version of 81 tiles mod doesn't reset the traffic lights any more; a constant monitoring of the lights should therefore not be necessary a. (I had the same problem with resetting lights and 81 tiles mod. I suggested BloodyPenguin to disable the reevaluation of the light status after loading a save game. That was accepted into the "UPDATE 8 (1/12/2016)" of 81 tiles mod.)

Hi!
I check them, i have a 25 tile unlocker.

I checked, and Traffic manager president edition is making them disapear.
but in weird fashion, like all lights are gone now :D