Yep, it looks like a driver problem. Talk to the store you bought it from and show them what it’s doing. They should send you either a replacement head or a whole light. Sorry about the bad luck.
Extra…
It does seem to come on brighter than 120 lumen. That’s a bit strange. Channel 1 does moonlight to about 120 lumen. Channel 2 does from there to about 900 lumen and then channel 3 is the FET and does from there to the max lumens. To have it start about the middle of channel 2 is something I’ve not seen. One possible explanation is the single 7135 current regulator on channel 1 is bad, plus a few of the 7 current regulators in channel 2 are also bad. The odds of that seem small. There might be an issue with the MCU and it’s programming. There is also a chance that a metal shaving is shorting out a circuit. That can lead to unpredictable results.
There was a person with a similar issue, but it was just channel 1 that was bad. From 120 lm and up it worked normally. IDK, you’d need a driver guru with an oscilloscope to test it to really find the problem. Or just replace all the 7135 chips with known good units from a reputable store. If that doesnt fix it, the problem is the MCU or a short.