You suffocated them with too heavy an application of neem. Did you spray to the point of heavy runoff, or mix the concentrate too strong? Less is more with that stuff- VERY fine, light mist. Let dry. Wait a day or so. Mist again. REpeat until there is a slight gloss to the leaves. Then maintain with weekly mists. SMC leaf wash is similar, but can be applied more heavily without risk.

BTW next time you post troubleshooting pics, you gotta get better lighting on them. It's lucky your problem's symptom is SHAPE not COLOR...