Old-Lumens, OP has the KD 8x7135 v2, your pictures show the Nanjg105/Qlite, this might lead to some confusion.
The KD driver has a different layout. I like him as a great alternative, for his different mode options and being without PWM-whine. You find more about it in this thread.
As you have single mode only, odds are you soldered LED- to GND. In the pic you see LED- as a solder pad on the upper left, it’s the smaller one compared to LED+.
LED- and GND (the outer copper ring) are not to be connected. They are very close, so this can happen easily.
