The pH for normal soil should be about 6.5. Gnarled, deformed leaves and vine-like growth are commonly symptoms of high pH. Be sure to test the pH of the soil itself rather than runoff.
There doesn't appear to be any necrosis or yellowing that's obvious in the already yellowish pic, so I'm inclined to say take care of the soil pH and give them a good all-around feeding when you do so.