I've got one plant doing the exact same thing. not as bad lately. the thing that caught my attn first off was the look of the strain. what strain is that? looks exactly like one of my plants from Dr.greenthumbseeds indoor mix. texture, growth, color.
Wish I had an answe for ya but I don't. I kinda gave up diagnosing those plants cause i've only got a few beans left and they are the only ones that give me problems, under same conditions as other plants side by side it's always the Drgreenthumb that give me probs.