Solar Pathlight not following settings

I have 4 Solar Pathlights installed in close proximity to each other (a few feet between devices) and one seems to be behaving differently than the others: I have them set to low motion sensitivity and to not turn on during the day but the light in question seems to be ignoring both of those. Also, it seems to be constantly returning to the default brightness setting, even though I want to have it set to the lowest possible value. How can I troubleshoot a device like this? Is there anything I can do to e.g. factory reset the device to see if it will honor the settings after starting fresh?