I have this light and a couple of batteries. An odd thing is happening - when I use one of the batteries, all three light intensities come on. When I use the second battery, however, the light stays in the middle intensity and won’t change no matter how many times I click it. I would have thought that the failure to move from low to medium to high would be a problem of the flashlight, but given that it happens with the one battery and not the other, I’m flummoxed. Any ideas? Thanks.