@GrowNorthern, thanks for your reply and explanation, confirming there is an issue. When I look through the gaps on both my lights, I can see dust grains settling on the diffuser. While I don't think a few grains is gonna make any difference, over time I think it will degrade performance.
Will you replace warped diffusers when a fix is ready?
Does the warping affect the optical performance, i. e. will the footprint be warped as well?
l