I'd say that "the haze" is plain flare. so light enters somewhere from the sides to the lens. I can reproduce it very easily with no flash etc with my 14mm dslr objective

its harder to try not to make it flare


(see center top of image)


for those who have the problem: how is your camera module positioned? mine is as left as it can be when looked from back. (so that the bigger holes edges dont barely overlap)