Hello, I planted 4 elderberries (Sambucus canadensis) in the spring, and they were all thriving up until about a month ago. At that time, some stalks on one (a 'Johns' cultivar) began looking withered with spots and crinkled leaves. It is planted in an area with partial sun,/shade, in a mixture of compost and native soil. There are still healthy unaffected stalks on the same plant, and there are 3 healthy unaffected elderberry plants nearby.
We viewed your photos. This looks like possible herbicide damage - puckering, crinkling, distortion, etc. May be from drift we cannot say for sure.
Prune some of the damaged stems back and see it it puts out normal growth.