I asked because overvoltage would be one way to explain what you’re seeing.
That is the original power supply, which is good, but we recommend against using voltage adapters. The power supply accepts EU voltage (as you can see on it), and usually functions much better on “clean” mains power. You might be able to find a cheap “plug shape” adapter, which I would is a better solution.
You *may* have a partial connection between LED10 and something else. Can you use your multimeter (with power off) to check the resistance between LED10 to each of the other “LEDX” lines?