USA PF Brick question

I've been getting familiar with my PowerFLARM brick and Butterfly display before installing it.

I created a flarmcfg.txt file and loaded it using a USB stick. The file loads ok as confirmed by the configuration indicating my glider ICAO address. However, after the expected flashing green/red LED sequence, the LED ends up being amber which is supposed to indicate the start-up sequence is still active. The unit operates normally and detects traffic. The LED stays amber whether the stick is removed or not.

On the next power up with memory stick removed, the LED ends up being green and the ICAO address is retained.

Anyone else see this amber LED after loading? If so, do you have an explanation?

thanks,
GY