Under optimal conditions 720P can show more than what your pics do, but don’t worry about it too much.
Sometimes they use threadlock. Try applying some heat. Also (I know it’s obvious but…) take a close look and make certain that you are unthreading in the correct direction.
If the reflector hides that much of each LED then it’s probably losing a lot of light. We don’t like centering rings which extend above the base of the LED. Please skim through this thread and look at the pics from two different lights (both found on page 1): No-name '6XL2' dissection